How to pass parameters to click event method using c#

Question

i have this button on my C# context:

<button id='Update' OnServerClick='UpdateCart'>Update</button>

now I wanna to pass parameter (num) to (UpdateCart) Method :

protected void UpdateCart(object sender, EventArgs e)
{

    Response.Cookies["Cart"]["Qty(" + num + ")"] = Request.Form["Qty" + num];
}

How I can do that ?

Answer 1

Use ASP.NET Button control instead of <button/> markup that allow you to set value via CommandArgument property and use Command event (do not use Click) to retrieve value of CommandArgument property.

Markup:

 <asp:Button 
              ID="Button1" 
              runat="server" 
              CommandArgument="10" 
              oncommand="Button1_Command" 
              Text="Button" />

Code:

protected void Button1_Command(object sender, CommandEventArgs e)
  {
      string value = e.CommandArgument.ToString();
  }

Answer 2

You would use the 'commandArgument' attribute. Here's an example on the MSDN

http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.commandargument.aspx