Data Controls :: Image Button Command Argument Is Blank In GridView

I use imagebutton in gridview that when I click on it, it delete row of gridview..below is code...

protected void DeleteCustomer1(object sender, EventArgs e)
{
ImageButton IMGDelete = (ImageButton)sender;
}
private void DeleteProduct(ImageButton IMGDelete)
{
using (SqlConnection conn = General.GetConnection())

[code]....

but when I click on imagbutton it didn't do any thing..I put break point and checked @ID value that was "_page" and I checked  IMG Delete. Command Argument value was "".I used .CommandArgument  for Linkbutton in other page I don't know is it right to use it for imagebutton?