Custom error page with try catch block

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C#

ASP.NET

Hi Folks,

I have set the custom error page so that when ever some error generate then the user will be redirected to a custom error page. But my problem is that system is not showing the custom error page despite experiencing errors.

Here is the code

web.config file
===================================

<customErrors mode="On" defaultRedirect="error.aspx">
      <error statusCode="500" redirect="error.aspx"/>
      <!-- Error Page -->
      <error statusCode="400" redirect="error.aspx"/>
      <!-- ASPX Page Not Found -->
    </customErrors>

===================================
General function
===================================

public DataSet GenerateDataset(string query)
    {
        
        if (conn.State == ConnectionState.Open)
            conn.Close();
        conn.Open();

        try
        {
            //adap = new OleDbDataAdapter(query, conn);
            adap = new OdbcDataAdapter(query, conn);
            ds = new DataSet();
            ds.Clear();
            adap.Fill(ds);
            return ds;
        }
        catch (Exception ex)
        {
           
            throw ex;
            
        }
        finally
        {
            adap.Dispose();
            conn.Close();
        }
    }

=======================================
Main Portion
=======================================

objGen = new GeneralFunction();
       ds = new DataSet();
       try
       {
           ds = objGen.GenerateDataset(strQuery);
           if (ds.Tables[0].Rows.Count > 0)
           {
               GridView1.DataSourceID = null;
               GridView1.DataSource = ds;
               GridView1.DataBind();
               Lbl_rc.ForeColor = System.Drawing.Color.Black;
               Lbl_rc.Font.Bold = true;
               Lbl_rc.Text = "<font color='#009933'>Total no of unconfirm orders : " + ds.Tables[0].Rows.Count + "</font>";
               trP1.Visible = true;
               GridView1.Visible = true;


           }
           else
           {
               GridView1.DataSourceID = null;
               Lbl_rc.ForeColor = System.Drawing.Color.Black;
               Lbl_rc.Font.Bold = true;
               Lbl_rc.Text = "<font color='#FF0000'>No unconfirm orders in the list.</font>";
               trP1.Visible = false;
               GridView1.Visible = false;

           }
       }
       catch(Exception ex)
       {

           Tabok.Visible = false;
           tab3.Visible = true;
           lblmsg.Visible = true;
           lblmsg.Text = "Error : " + ex.Message;

       }
       finally
       {

           strQuery = "";
           ds.Dispose();
           objGen = null;
       }

Please let me know what is wrong with above code