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 ?

KV Prajapati · Accepted Answer · 2011-12-16 05:36:23Z

6

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();
  }

edited Dec 16, 2011 at 5:36

answered Dec 16, 2011 at 5:31

KV Prajapati

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2 Comments

Hatem Over a year ago

I Do all that but still cannot access the value (e.CommandArgument) it is empty

KV Prajapati Over a year ago

@Hatem - Yes! I think there is something missing. You have to update your post and add working code in it.

Joe · Accepted Answer · 2011-12-16 05:26:32Z

4

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

answered Dec 16, 2011 at 5:26

Joe

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1 Comment

Hatem Over a year ago

I Do all that but still cannot access the value (e.CommandArgument) it is null

Anicho · Accepted Answer · 2013-07-24 10:33:11Z

1

I noticed that command argument does not accept dynamically set values from client side, command argument must be set server side. So to combat this I used asp:hidden field updated its value and then from code behind got the value by just doing hiddenfield.value.

answered Jul 24, 2013 at 10:33

Anicho

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