Project compile perfectly but i get unhandled exception and have no idea why??? any clues?

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Posted by JB on Stack Overflow See other posts from Stack Overflow or by JB
Published on 2010-04-28T04:30:31Z Indexed on 2010/04/28 4:33 UTC
Read the original article Hit count: 642

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get unhandled exception that says:

System.NullReferenceException: Object reference not set to an instance of an object. at Eagle_Eye_Class_Finder.GetSchedule.GetDataFromNumber(String ID) in C:\Users\Joshua Banks\Desktop\EET Project\Eagle Eye Class Finder\GetSchedule.cs:line 24 at Eagle_Eye_Class_Finder.Form1.button2_Click(Object sender, EventArgs e) in C:\Users\Joshua Banks\Desktop\EET Project\Eagle Eye Class Finder\Form1.cs:line 196 at System.Windows.Forms.Control.OnClick(EventArgs e) at System.Windows.Forms.Button.OnClick(EventArgs e) at System.Windows.Forms.Button.PerformClick() at System.Windows.Forms.Form.ProcessDialogKey(Keys keyData) at System.Windows.Forms.Control.ProcessDialogKey(Keys keyData) at System.Windows.Forms.TextBoxBase.ProcessDialogKey(Keys keyData) at System.Windows.Forms.Control.PreProcessMessage(Message& msg) at System.Windows.Forms.Control.PreProcessControlMessageInternal(Control target, Message& msg) at System.Windows.Forms.Application.ThreadContext.PreTranslateMessage(MSG& msg)

Here is my Get Schedule Class:

using System; using System.IO; using System.Data; using System.Text; using System.Drawing; using System.Data.OleDb; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Drawing.Printing; using System.Collections.Generic;

namespace Eagle_Eye_Class_Finder {

public class GetSchedule
{
    public string GetDataFromNumber(string ID)
    {
        IDnumber[] IDnumbers = new IDnumber[3];
        foreach (IDnumber IDCandidateMatch in IDnumbers)
        {

            if (IDCandidateMatch.ID == ID)
            {
                StringBuilder myData = new StringBuilder();
                myData.AppendLine(IDCandidateMatch.Name);
                myData.AppendLine(": ");
                myData.AppendLine(IDCandidateMatch.ID);
                myData.AppendLine(IDCandidateMatch.year);
                myData.AppendLine(IDCandidateMatch.class1);
                myData.AppendLine(IDCandidateMatch.class2);
                myData.AppendLine(IDCandidateMatch.class3);
                myData.AppendLine(IDCandidateMatch.class4);
                //return myData;
                return myData.ToString();
            }
        }
        return "";
    }

    public GetSchedule()
    {
        IDnumber[] IDnumbers = new IDnumber[3];
        IDnumbers[0] = new IDnumber() { Name = "Joshua Banks", ID = "900456317", year = "Senior", class1 = "TEET 4090", class2 = "TEET 3020", class3 = "TEET 3090", class4 = "TEET 4290" };
        IDnumbers[1] = new IDnumber() { Name = "Sean Ward", ID = "900456318", year = "Junior", class1 = "ENGNR 4090", class2 = "ENGNR 3020", class3 = "ENGNR 3090", class4 = "ENGNR 4290" };
        IDnumbers[2] = new IDnumber() { Name = "Terrell Johnson", ID = "900456319", year = "Sophomore", class1 = "BUS 4090", class2 = "BUS 3020", class3 = "BUS 3090", class4 = "BUS 4290" };

    }
    public class IDnumber
    {
        public string Name { get; set; }
        public string ID { get; set; }
        public string year { get; set; }
        public string class1 { get; set; }
        public string class2 { get; set; }
        public string class3 { get; set; }
        public string class4 { get; set; }


       public static void ProcessNumber(IDnumber myNum)
            {
                StringBuilder myData = new StringBuilder();
                myData.AppendLine(myNum.Name);   
                myData.AppendLine(": ");
                myData.AppendLine(myNum.ID);
                myData.AppendLine(myNum.year);
                myData.AppendLine(myNum.class1);
                myData.AppendLine(myNum.class2);
                myData.AppendLine(myNum.class3);
                myData.AppendLine(myNum.class4);  
                MessageBox.Show(myData.ToString());
            }




    }

}

}

Here is my Form 1 class:

using System; using System.IO; using System.Data; using System.Text; using System.Drawing; using System.Data.OleDb; using System.Collections; using System.Windows.Forms; using System.ComponentModel; using System.Drawing.Printing; using System.Collections.Generic;

namespace Eagle_Eye_Class_Finder {

/// This form is the entry form, it is the first form the user will see when the app is run.
/// 

public class Form1 : System.Windows.Forms.Form
{
    private System.Windows.Forms.TextBox textBox1;
    private System.Windows.Forms.ProgressBar progressBar1;
    private System.Windows.Forms.PictureBox pictureBox1;
    private System.Windows.Forms.Button button2;
    private System.Windows.Forms.DateTimePicker dateTimePicker1;
    private IContainer components;
    private Timer timer1;
    private BindingSource form1BindingSource;
    public static Form Mainform = null;

    // creates new instance of second form
    YOURCLASSSCHEDULE SecondForm = new YOURCLASSSCHEDULE();

    public Form1()
    {
        InitializeComponent();

        // TODO: Add any constructor code after InitializeComponent call

    }

    /// Clean up any resources being used.

    protected override void Dispose(bool disposing)
    {
        if (disposing)
        {
            if (components != null)
            {
                components.Dispose();
            }
        }
        base.Dispose(disposing);
    }

    #region Windows Form Designer generated code
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
        this.components = new System.ComponentModel.Container();
        System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
        this.textBox1 = new System.Windows.Forms.TextBox();
        this.progressBar1 = new System.Windows.Forms.ProgressBar();
        this.pictureBox1 = new System.Windows.Forms.PictureBox();
        this.button2 = new System.Windows.Forms.Button();
        this.dateTimePicker1 = new System.Windows.Forms.DateTimePicker();
        this.timer1 = new System.Windows.Forms.Timer(this.components);
        this.form1BindingSource = new System.Windows.Forms.BindingSource(this.components);
        ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
        ((System.ComponentModel.ISupportInitialize)(this.form1BindingSource)).BeginInit();
        this.SuspendLayout();
        // 
        // textBox1
        // 
        this.textBox1.BackColor = System.Drawing.SystemColors.ActiveCaption;
        this.textBox1.DataBindings.Add(new System.Windows.Forms.Binding("Text", this.form1BindingSource, "Text", true, System.Windows.Forms.DataSourceUpdateMode.OnValidation, null, "900456317"));
        this.textBox1.Location = new System.Drawing.Point(328, 280);
        this.textBox1.Name = "textBox1";
        this.textBox1.Size = new System.Drawing.Size(208, 20);
        this.textBox1.TabIndex = 2;
        this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
        // 
        // progressBar1
        // 
        this.progressBar1.Location = new System.Drawing.Point(258, 410);
        this.progressBar1.MarqueeAnimationSpeed = 10;
        this.progressBar1.Name = "progressBar1";
        this.progressBar1.Size = new System.Drawing.Size(344, 8);
        this.progressBar1.TabIndex = 3;
        this.progressBar1.Click += new System.EventHandler(this.progressBar1_Click);
        // 
        // pictureBox1
        // 
        this.pictureBox1.BackColor = System.Drawing.SystemColors.ControlLightLight;
        this.pictureBox1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
        this.pictureBox1.Image = ((System.Drawing.Image)(resources.GetObject("pictureBox1.Image")));
        this.pictureBox1.Location = new System.Drawing.Point(680, 400);
        this.pictureBox1.Name = "pictureBox1";
        this.pictureBox1.Size = new System.Drawing.Size(120, 112);
        this.pictureBox1.TabIndex = 4;
        this.pictureBox1.TabStop = false;
        this.pictureBox1.Click += new System.EventHandler(this.pictureBox1_Click);
        // 
        // button2
        // 
        this.button2.Font = new System.Drawing.Font("Mistral", 15.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        this.button2.Image = ((System.Drawing.Image)(resources.GetObject("button2.Image")));
        this.button2.Location = new System.Drawing.Point(699, 442);
        this.button2.Name = "button2";
        this.button2.Size = new System.Drawing.Size(78, 28);
        this.button2.TabIndex = 5;
        this.button2.Text = "OK";
        this.button2.Click += new System.EventHandler(this.button2_Click);
        // 
        // dateTimePicker1
        // 
        this.dateTimePicker1.Location = new System.Drawing.Point(336, 104);
        this.dateTimePicker1.Name = "dateTimePicker1";
        this.dateTimePicker1.Size = new System.Drawing.Size(200, 20);
        this.dateTimePicker1.TabIndex = 6;
        this.dateTimePicker1.ValueChanged += new System.EventHandler(this.dateTimePicker1_ValueChanged);
        // 
        // timer1
        // 
        this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
        // 
        // form1BindingSource
        // 
        this.form1BindingSource.DataSource = typeof(Eagle_Eye_Class_Finder.Form1);
        // 
        // Form1
        // 
        this.AcceptButton = this.button2;
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));
        this.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;
        this.ClientSize = new System.Drawing.Size(856, 556);
        this.Controls.Add(this.dateTimePicker1);
        this.Controls.Add(this.button2);
        this.Controls.Add(this.pictureBox1);
        this.Controls.Add(this.progressBar1);
        this.Controls.Add(this.textBox1);
        this.Name = "Form1";
        this.Text = "Eagle Eye Class Finder";
        this.Load += new System.EventHandler(this.Form1_Load);
        ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
        ((System.ComponentModel.ISupportInitialize)(this.form1BindingSource)).EndInit();
        this.ResumeLayout(false);
        this.PerformLayout();

    }
    #endregion

    /// The main entry point for the application.

    [STAThread]
    static void Main()
    {
        Application.Run(new Form1());

    }

    public void Form1_Load(object sender, System.EventArgs e)
    {


    }

    public void textBox1_TextChanged(object sender, System.EventArgs e)
    {
        //allows only numbers to be entered in textbox
        string Str = textBox1.Text.Trim();
        double Num;
        bool isNum = double.TryParse(Str, out Num);

        if (isNum)

            Console.ReadLine();

        else
            MessageBox.Show("Enter A Valid ID Number!");                              

    }

    public void button2_Click(object sender, System.EventArgs e)
    {
        string text = textBox1.Text;
        Mainform = this;

        this.Hide();

        GetSchedule myScheduleFinder = new GetSchedule();
        string result = myScheduleFinder.GetDataFromNumber(text);

        if (!string.IsNullOrEmpty(result))
        {
            MessageBox.Show(result);
        }
        else
        {
            MessageBox.Show("Enter A Valid ID Number!");
        }
    }


    public void dateTimePicker1_ValueChanged(object sender, System.EventArgs e)
    {

    }

    public void pictureBox1_Click(object sender, System.EventArgs e)
    {

    }

    public void progressBar1_Click(object sender, EventArgs e)
    {
        //this.progressBar1 = new System.progressBar1();
        //progressBar1.Maximum = 200;
        //progressBar1.Minimum = 0;
        //progressBar1.Step = 20;

    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        //if (progressBar1.Value >= 200 )
        //{
        //progressBar1.Value = 0;
        //}
        //return;
        //}

        //progressBar1.Value != 20;

    }

    }

}

here is my form 2 class:

using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms;

namespace Eagle_Eye_Class_Finder { /// /// Summary description for Form2. /// public class YOURCLASSSCHEDULE : System.Windows.Forms.Form { public System.Windows.Forms.LinkLabel linkLabel1; public System.Windows.Forms.LinkLabel linkLabel2; public System.Windows.Forms.LinkLabel linkLabel3; public System.Windows.Forms.LinkLabel linkLabel4; private Button button1;

    /// Required designer variable.

    public System.ComponentModel.Container components = null;

    public YOURCLASSSCHEDULE()
    {

        //
        InitializeComponent();

        // TODO: Add any constructor code after InitializeComponent call

    }

    /// Clean up any resources being used.
    protected override void Dispose(bool disposing)
    {
        if (disposing)
        {
            if (components != null)
            {
                components.Dispose();
            }
        }
        base.Dispose(disposing);
    }

    #region Windows Form Designer generated code
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
        System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(YOURCLASSSCHEDULE));
        this.linkLabel1 = new System.Windows.Forms.LinkLabel();
        this.linkLabel2 = new System.Windows.Forms.LinkLabel();
        this.linkLabel3 = new System.Windows.Forms.LinkLabel();
        this.linkLabel4 = new System.Windows.Forms.LinkLabel();
        this.button1 = new System.Windows.Forms.Button();
        this.SuspendLayout();
        // 
        // linkLabel1
        // 
        this.linkLabel1.BackColor = System.Drawing.SystemColors.ActiveCaption;
        this.linkLabel1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
        this.linkLabel1.Font = new System.Drawing.Font("Times New Roman", 14.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        this.linkLabel1.LinkArea = new System.Windows.Forms.LinkArea(0, 7);
        this.linkLabel1.LinkBehavior = System.Windows.Forms.LinkBehavior.HoverUnderline;
        this.linkLabel1.Location = new System.Drawing.Point(41, 123);
        this.linkLabel1.Name = "linkLabel1";
        this.linkLabel1.Size = new System.Drawing.Size(288, 32);
        this.linkLabel1.TabIndex = 1;
        this.linkLabel1.TabStop = true;
        this.linkLabel1.Text = "Class 1";
        this.linkLabel1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
        this.linkLabel1.LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkLabel1_LinkClicked);
        // 
        // linkLabel2
        // 
        this.linkLabel2.BackColor = System.Drawing.SystemColors.ActiveCaption;
        this.linkLabel2.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
        this.linkLabel2.Font = new System.Drawing.Font("Times New Roman", 14.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        this.linkLabel2.LinkBehavior = System.Windows.Forms.LinkBehavior.HoverUnderline;
        this.linkLabel2.Location = new System.Drawing.Point(467, 123);
        this.linkLabel2.Name = "linkLabel2";
        this.linkLabel2.Size = new System.Drawing.Size(288, 32);
        this.linkLabel2.TabIndex = 2;
        this.linkLabel2.TabStop = true;
        this.linkLabel2.Text = "Class 2";
        this.linkLabel2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
        this.linkLabel2.VisitedLinkColor = System.Drawing.Color.Navy;
        this.linkLabel2.LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkLabel2_LinkClicked);
        // 
        // linkLabel3
        // 
        this.linkLabel3.BackColor = System.Drawing.SystemColors.ActiveCaption;
        this.linkLabel3.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
        this.linkLabel3.Font = new System.Drawing.Font("Times New Roman", 14.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        this.linkLabel3.LinkBehavior = System.Windows.Forms.LinkBehavior.HoverUnderline;
        this.linkLabel3.Location = new System.Drawing.Point(41, 311);
        this.linkLabel3.Name = "linkLabel3";
        this.linkLabel3.Size = new System.Drawing.Size(288, 32);
        this.linkLabel3.TabIndex = 3;
        this.linkLabel3.TabStop = true;
        this.linkLabel3.Text = "Class 3";
        this.linkLabel3.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
        this.linkLabel3.LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkLabel3_LinkClicked);
        // 
        // linkLabel4
        // 
        this.linkLabel4.BackColor = System.Drawing.SystemColors.ActiveCaption;
        this.linkLabel4.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
        this.linkLabel4.Font = new System.Drawing.Font("Times New Roman", 14.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        this.linkLabel4.LinkBehavior = System.Windows.Forms.LinkBehavior.HoverUnderline;
        this.linkLabel4.Location = new System.Drawing.Point(467, 311);
        this.linkLabel4.Name = "linkLabel4";
        this.linkLabel4.Size = new System.Drawing.Size(288, 32);
        this.linkLabel4.TabIndex = 4;
        this.linkLabel4.TabStop = true;
        this.linkLabel4.Text = "Class 4";
        this.linkLabel4.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
        this.linkLabel4.LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkLabel4_LinkClicked);
        // 
        // button1
        // 
        this.button1.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
        this.button1.FlatAppearance.BorderColor = System.Drawing.Color.FromArgb(((int)(((byte)(0)))), ((int)(((byte)(0)))), ((int)(((byte)(64)))));
        this.button1.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
        this.button1.Font = new System.Drawing.Font("Pristina", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        this.button1.ForeColor = System.Drawing.SystemColors.ActiveCaption;
        this.button1.ImageAlign = System.Drawing.ContentAlignment.TopCenter;
        this.button1.Location = new System.Drawing.Point(358, 206);
        this.button1.Name = "button1";
        this.button1.Size = new System.Drawing.Size(101, 25);
        this.button1.TabIndex = 5;
        this.button1.Text = "Go Back";
        this.button1.UseVisualStyleBackColor = false;
        this.button1.Click += new System.EventHandler(this.button1_Click);
        // 
        // YOURCLASSSCHEDULE
        // 
        this.AutoScaleBaseSize = new System.Drawing.Size(6, 15);
        this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));
        this.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;
        this.ClientSize = new System.Drawing.Size(790, 482);
        this.Controls.Add(this.button1);
        this.Controls.Add(this.linkLabel4);
        this.Controls.Add(this.linkLabel3);
        this.Controls.Add(this.linkLabel2);
        this.Controls.Add(this.linkLabel1);
        this.Font = new System.Drawing.Font("OldDreadfulNo7 BT", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        this.Name = "YOURCLASSSCHEDULE";
        this.Text = "Your Classes";
        this.Load += new System.EventHandler(this.Form2_Load);
        this.ResumeLayout(false);

    }
    #endregion

    public void Form2_Load(object sender, System.EventArgs e)
    {
       // if (text == "900456317")
       // {

        //}

    }

    public void linkLabel1_LinkClicked(object sender, System.Windows.Forms.LinkLabelLinkClickedEventArgs e)
    {

        System.Diagnostics.Process.Start("http://www.georgiasouthern.edu/map/");
    }

    private void linkLabel2_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
    {
        System.Diagnostics.Process.Start("http://www.georgiasouthern.edu/map/");
    }

    private void linkLabel3_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
    {
        System.Diagnostics.Process.Start("http://www.georgiasouthern.edu/map/");
    }

    private void linkLabel4_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
    {
        System.Diagnostics.Process.Start("http://www.georgiasouthern.edu/map/");
    }

    private void button1_Click(object sender, EventArgs e)
    {
        Form1 form1 = new Form1();
        form1.Show();
        this.Hide();
    }
}

}

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