Re: [Microsofts_C_Sharp] DataValueField Problem

Mon, 23 May 2005 19:00:40 -0700

You bum...  Just ask your question on one email group, not multiple.  Answer is adding catID to the query

On 5/23/05, Coosa A. <[EMAIL PROTECTED]> wrote:

Hi all,

 

I'm testing a web control with Northwind Database. Using a drop down list:

protected System.Web.UI.WebControls.DropDownList TestDDL;

Suppose, that the connection is successful with the table "Categories" and I would like to view in the Drop Down List the "CategoryName" Columns, but I'd like to obtain on the other hand the "CategoryID" to continue with my processing since what concerns me is the ID and not the name. When a user selects one of the displayed names, i'd like to capture the corresponding ID of that name in the database table.

 For instance:

 

 

private void Page_Load(object sender, System.EventArgs e)

{

            NorthWSqlConn.Open(); // Connection opened

            String NorthWSqlCmdStr = "SELECT CategoryName FROM Categories ORDER BY CategoryName"; //SQL Select Statement

            SqlCommand NorthWSqlCmd = new SqlCommand (NorthWSqlCmdStr,NorthWSqlConn);

            TestDDL.DataTextField = "CategoryName"; //Here to map the displayed text with the database table column

            //TestDDL.DataValueField = "CategoryID"; // this fails if I uncomment

            NorthWSqlDA.Fill(NorthWDS);

            TestDDL.DataSource = NorthWSqlCmd.ExecuteReader();

            TestDDL.DataBind();

            NorthWSqlConn.Close();

}

 

My problem is with the commented line; namely, //TestDDL.DataValueField = "CategoryID";

If uncommented, i get the following error:

 

Server Error in '/WebApplication1' Application.

--------------------------------------------------------------------------------

 

DataBinder.Eval: 'System.Data.Common.DbDataRecord' does not contain a property with the name CategoryID.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

 

Exception Details: System.Web.HttpException: DataBinder.Eval: 'System.Data.Common.DbDataRecord' does not contain a property with the name CategoryID.

 

Source Error:

 

 

Line 36:                                  NorthWSqlDA.Fill(NorthWDS);

Line 37:                                  TestDDL.DataSource = NorthWSqlCmd.ExecuteReader();

Line 38:                                  TestDDL.DataBind();

Line 39:                                  NorthWSqlConn.Close();

Line 40:                      }

 

//Red Line on Line 38

 

Stack Trace:

 

 

[HttpException (0x80004005): DataBinder.Eval: 'System.Data.Common.DbDataRecord' does not contain a property with the name CategoryID.]

   System.Web.UI.DataBinder.GetPropertyValue(Object container, String propName) +147

   System.Web.UI.DataBinder.GetPropertyValue(Object container, String propName, String format) +12

   System.Web.UI.WebControls.ListControl.OnDataBinding(EventArgs e) +472

   System.Web.UI.Control.DataBind() +26

   TestWebApp.TestWF.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\webapplication1\testwf.aspx.cs:38

   System.Web.UI.Control.OnLoad(EventArgs e) +67

   System.Web.UI.Control.LoadRecursive() +35

   System.Web.UI.Page.ProcessRequestMain() +750

 

 

 

Now how do I some how solve this?

 

Coosa

 

--------------------------------------------------------------------------------

Version Information: Microsoft .NET Framework Version:1.1.4322.2032; ASP.NET Version:1.1.4322.2032

 

 


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