C# – Command behind a GridView ButtonField

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I got a question about the command behind a ButtonField (image type) in a GridView.

Got a GridView called gvIngevuld in wich I show rows of data and 1 ButtonField row.
Now I have to put code behind these buttons (Each of them the same) to put some things in PDF format.
The problem is I don't know how to put code behind these buttons ?
The code I have :

<asp:ButtonField ButtonType="Image" ImageUrl="~/Images/pdf.png"  CommandName="pdf_click" />

As you can see I used the CommandName="pdf_click" property but when I click one of the buttons there's only a postback but nothing happens.
Anyone who can help me out here ?

in case needed, code behind :

protected void pdf_click(object sender, EventArgs e)
{
    lblWelkom.Text = "Succes!";
}

Thanks.

Best Answer

You should use RowCommand event of gridview. Set the commandArgument to your item's unique key. (By default, it passes the row's index) 

void gvIngevuld_RowCommand(Object sender, GridViewCommandEventArgs e)
 {
 // If multiple buttons are used in a GridView control, use the
 // CommandName property to determine which button was clicked.
 if(e.CommandName=="pdf_click")
  {
   // Convert the row index stored in the CommandArgument
   // property to an Integer.
   int index = Convert.ToInt32(e.CommandArgument);

   // Retrieve the row that contains the button clicked 
   // by the user from the Rows collection.
   GridViewRow row = gvIngevuld.Rows[index]; 
   //gbIngevuld is your GridView's name

   // Now you have access to the gridviewrow.
  }  
}

Also, If you have set the DataKeyNames of the gridview, you can access it as follows: 

    int index = Convert.ToInt32(e.CommandArgument);
    int ServerID = Convert.ToInt32(GridView1.DataKeys[index].Value);
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