Trouble finding the dynamic templatefield control in a gridview

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Hi,
I have a gridview where I in codebehind add a templatefield

C++

TemplateField resultField = new TemplateField();
  resultField.HeaderTemplate = new ResultIntTemplate DataControlRowType.Header, header);
resultField.EditItemTemplate = new ResultIntEditTemplate(DataControlRowType.DataRow, header);
                               resultField.ItemTemplate = new ResultIntTemplate(DataControlRowType.DataRow, header);

My issue is when I'm trying to update I cannot find the control.

Here is my EditItemTemplate

C++

public class ResultIntEditTemplate : ITemplate
  {
      private DataControlRowType templateType;
      private string columnName;

      public ResultIntEditTemplate(DataControlRowType type, string colname)
      {
          templateType = type;
          columnName = colname;
      }

      public void InstantiateIn(System.Web.UI.Control container)
      {
          TextBox field_txtbox = new TextBox();
          field_txtbox.ID = "Result";
          field_txtbox.Text = String.Empty;
          field_txtbox.DataBinding += new EventHandler(Result_DataBinding);

          container.Controls.Add(field_txtbox);
      }

private void Result_DataBinding(Object sender, EventArgs e)
      {
          object bound_value_obj = null;
          TextBox field_txtbox = (TextBox)sender;
          field_txtbox.Width = 24;

          GridViewRow row = (GridViewRow)field_txtbox.NamingContainer;
                   bound_value_obj = DataBinder.Eval(row.DataItem, "Result");
          if (bound_value_obj == null)
          {
              field_txtbox.Text = String.Empty;
          }
          else
          {
              field_txtbox.Text = bound_value_obj.ToString();
          }
     }
}

In my update command when i try to find the "Result" textbox I get a null object

C#

protected void OnUpdate(object sender, GridViewUpdateEventArgs e)
        {
            object res = GridView1.Rows[GridView1.EditIndex].FindControl("Result");
        }

Could anyone guide me in finding the "Result" control.

Thanks in advance
Morten

Posted 15-Dec-10 10:31am

MortenEstrup

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thatraja · Answer 1 · 2010-12-15T12:54:00

I think problem in your code

C#

protected void OnUpdate(object sender, GridViewUpdateEventArgs e)
        {
            object res = GridView1.Rows[GridView1.EditIndex].FindControl("Result");
        }

It should be

C#

protected void OnUpdate(object sender, GridViewUpdateEventArgs e)
        {
            object res = GridView1.Rows[e.RowIndex].FindControl("Result");
TextBox txtResult = (TextBox)GridView1.Rows[e.RowIndex].FindControl("Result"); //Use casting to get the result as appropriate object. Here you can get Textbox
        }

For more information refer the below one.

Simple Insert, Select, Edit, Update and Delete in Asp.Net GridView control[^]

MortenEstrup · Answer 2 · 2010-12-15T22:03:00

Thanks for the reply,

I'm still getting a null object.

In the gridview there is another templatefield "Name" that consist of two boundfields("Firstname" and "Lastname")
This column is added in the design phase and not in the codebehind.
I don't have any trouble finding those controls using the ID added in the markup

C++

object firstname = GridView1.Rows[e.RowIndex].FindControl("FirstnameLabel");

My issue is with the result column that I add in codebehind.

Any comments/suggestions are more than welcome :)

Best Morten

Trouble finding the dynamic templatefield control in a gridview

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