Dropdownlist and Datareader
- by salvationishere
After trying many solutions listed on the internet I am very confused now. I have a C#/SQL web application for which I am simply trying to bind an ExecuteReader command to a Dropdownlist so the user can select a value. This is a VS2008 project on an XP OS.
How it works is after the user selects a table, I use this selection as an input parameter to a method from my Datamatch.aspx.cs file. Then this Datamatch.aspx.cs file calls a method from my ADONET.cs class file. Finally this method executes a SQL procedure to return the list of columns from that table. (These are all tables in Adventureworks DB). I know that this method returns successfully the list of columns if I execute this SP in SSMS. However, I'm not sure how to tell if it works in VS or not.
This should be simple. How can I do this? Here is some of my code. The T-sQL stored proc:
CREATE PROCEDURE [dbo].[getColumnNames]
@TableName VarChar(50) AS
BEGIN
SET NOCOUNT ON;
SELECT col.name 'COLUMN_NAME' FROM sysobjects obj
INNER JOIN syscolumns col ON obj.id = col.id
WHERE obj.name = @TableName
END
It gives me desired output when I execute following from SSMS: exec getColumnNames 'AddressType'
And the code from Datamatch.aspx.cs file currently is:
// Add DropDownList Control to Placeholder
private void CreateDropDownLists()
{
SqlDataReader dr2 = ADONET_methods.DisplayTableColumns(targettable);
int NumControls = targettable.Length;
DropDownList ddl = new DropDownList();
}
Where ADONET_methods.DisplayTableColumns(targettable) is:
public static SqlDataReader DisplayTableColumns(string tt)
{
SqlDataReader dr = null;
string TableName = tt;
string connString = "Server=(local);Database=AdventureWorks;Integrated Security = SSPI";
string errorMsg;
SqlConnection conn2 = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand("getColumnNames"); //conn2.CreateCommand();
try
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.Connection = conn2;
SqlParameter parm = new SqlParameter("@TableName", SqlDbType.VarChar);
parm.Value = "Person." + TableName.Trim();
parm.Direction = ParameterDirection.Input;
cmd.Parameters.Add(parm);
conn2.Open();
dr = cmd.ExecuteReader();
}
catch (Exception ex)
{
errorMsg = ex.Message;
}
return dr;
}
