Input string was not in the correct format using int.Parse
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JDWebs
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Published on 2012-07-08T08:54:12Z
Indexed on
2012/07/08
9:15 UTC
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I have recently been making a login 'representation' which is not secure. So before answering, please note I am aware of security risks etc., and this will not be on a live site. Also note I am a beginner :P.
For my login representation, I am using LINQ to compare values of a DDL to select a username and a Textbox to enter a password, when a login button is clicked. However, an error is thrown 'Input string was not in the correct format', when using int.Parse.
Front End:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Login_Test.aspx.cs" Inherits="Login_Login_Test" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Login Test</title>
</head>
<body>
<form id="LoginTest" runat="server">
<div>
<asp:DropDownList ID="DDL_Username" runat="server" Height="20px"
DataTextField="txt">
</asp:DropDownList>
<br />
<asp:TextBox ID="TB_Password" runat="server" TextMode="Password"></asp:TextBox>
<br />
<asp:Button ID="B_Login" runat="server" onclick="B_Login_Click" Text="Login" />
<br />
<asp:Literal ID="LI_Result" runat="server"></asp:Literal>
</div>
</form>
</body>
</html>
Back End:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Login_Login_Test : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
Binder();
}
}
private void Binder()
{
using (DataClassesDataContext db = new DataClassesDataContext())
{
DDL_Username.DataSource = from x in db.DT_Honeys select new { id = x.UsernameID, txt = x.Username };
DDL_Username.DataValueField = "id";
DDL_Username.DataTextField = "txt";
DDL_Username.DataBind();
}
}
protected void B_Login_Click(object sender, EventArgs e)
{
if (TB_Password.Text != "")
{
using (DataClassesDataContext db = new DataClassesDataContext())
{
DT_Honey blah = new DT_Honey();
blah = db.DT_Honeys.SingleOrDefault(x => x.UsernameID == int.Parse(DDL_Username.SelectedValue.ToString()));
if (blah == null)
{
LI_Result.Text = "Something went wrong :/";
}
if (blah.Password == TB_Password.Text)
{
LI_Result.Text = "Credentials recognised :-)";
}
else
{
LI_Result.Text = "Error with credentials :-(";
}
}
}
}
}
I am aware this problem is very common, but none of the help I have found online is useful/relevant.
Any help/suggestions appreciated; thank you for your time :-).
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