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Problem with exception

575 Views
Last Modified: 2013-12-05
Hi,
I get this error

Server Error in '/App18_devst' Application.

'ite2_ddl' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value
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.ArgumentOutOfRangeException: 'ite2_ddl' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

Source Error:


An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:



[ArgumentOutOfRangeException: 'ite2_ddl' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value]
   System.Web.UI.WebControls.ListControl.set_SelectedValue(String value) +12587357
   App18._Default.refresh_pg() +6112
   App18._Default.lb_edt_Click(Object sender, EventArgs e) +86
   System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) +153
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3804

 


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18408

due to the codes below. why?
            conn.Open();
            try
            {
                cmd = new OleDbCommand("SELECT a.id,a.fld_name FROM ite1 a,ite2 b where ite2_name=b.fld_name and b.fld_name=@ite2 order by 1", conn);

                cmd.Parameters.Add("@ite2", OleDbType.VarChar).Value = ite2_ddl.SelectedValue;
                reader = cmd.ExecuteReader();
                ite1_ddl.Items.Add(new ListItem("Please select", "0"));
                while (reader.Read())
                {
                    ite1_ddl.Items.Add(new ListItem(reader[1].ToString(), reader[0].ToString()));
                }
            }
            ...

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This problem has been solved!
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