Event handling for dynamically added TemplateField column in gridview

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4.67/5 (3 votes)

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.NET3.5

Hi,

I have gridview control with dynamically added templatefield using ITemplate interface and InstantiateIn() method which is as follows.

C#

public class MyTemplate:ITemplate
   {
       #region ITemplate Members
       public void InstantiateIn(Control container)
       {
           //EventHandlerClass MyEventClass = new EventHandlerClass();
           LinkButton link = new LinkButton();
           link.ID="lnk";
           link.CommandName="Update";
           link.EnableViewState = true;
           link.Text="Update";
           link.ToolTip="Click to Update Details";
           //link.Click+=new DelegateClickEvent(MyEventClass.Show);

           container.Controls.Add(link);
       }
       #endregion
   }

I am successfully able to add itemtemplate link button to gridview but I am stuck to hadle Events for linkbutton(ItemTemplate) column. Even unable to fire GridView event GridView_RowCommand() i.e after clicking link button event doesn't get fired.

Please help me on the same.

Thank you in advance.

Posted 27-Apr-11 2:25am

shashank1487

Updated 27-Apr-11 2:27am

Sandeep Mewara

v2

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Comments

jim lahey 27-Apr-11 9:37am

Of course your event won't fire, you've commented out the line that assigns your event handler

R. Giskard Reventlov 27-Apr-11 10:14am

:-)

shashank1487 28-Apr-11 1:52am

Well jim even on removing the comment the event does not fire

jim lahey 28-Apr-11 4:18am

my point is that if you want people to help you, you have to help them by providing a correct example

YOGESH DHAGE 28-Apr-11 7:31am

Had you debug code before event occur.I think it will help you what exactly happen,before you come across the event.

Hemant__Sharma 3-May-11 3:17am

Please check my updated solution

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Hemant__Sharma · Answer 1 · 2011-04-29T12:19:00

Hello Shashank,

you need to bubble up the click event to its naming container i.e. GridView:

public class MyTemplateField : Control, ITemplate
    {
        Button btnCommand;
        public string CommandName { get; set; }
        public MyTemplateField()
        {
            btnCommand = new Button();
            btnCommand.ID = "btnInTemplateField";
            btnCommand.Text = "Template Field's button";
            btnCommand.Click += new EventHandler(btn_Click);
            CommandName = "Update";
        }
        void btn_Click(object sender, EventArgs e)
        {
            //Create command event arguments
            CommandEventArgs commandEventArgs = new CommandEventArgs(this.CommandName, btnCommand);
            //Bubble the command event to the container of MyTemplateField i.e. GridView
            RaiseBubbleEvent(btnCommand, commandEventArgs);
        }
        public void InstantiateIn(Control container)
        {
            container.Controls.Add(btnCommand);
        }
    }

Hope this will help.

Thanks,
Hemant

Wonde Tadesse · Answer 2 · 2011-04-29T14:31:00

@Hemant-Sharma is wright. ASP.Net doesn't retain dynamically created controls once there are created. Unless you call for each post back on Page_Load() or somewhere else. For example

protected void Page_Load(object sender, EventArgs e)
{
    LinkButton lb = new LinkButton();
    lb.Text = "Click me"
    lb.Click += new EventHandler(clickMe);
    this.Panel1.Controls.Add(lb);
}
private void clickMe(object sender, EventArgs e)
{

}

The link button will raise it's event whenever click, which eventually calls a post back. Without doing this it won't retain it's event.

I hope this will give you a clue.

Event handling for dynamically added TemplateField column in gridview

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