Gridview Control

if (e.CommandName == "Show")
{
GridViewRow row = (GridViewRow)((Control)e.CommandSource).NamingContainer;
int DemoId = Convert.ToInt32(gvdemo.DataKeys[row.RowIndex].Value);
//You will get id here.....You code goes Here....
}
else if (e.CommandName == "Select1")
{
GridViewRow row = (GridViewRow)((Control)e.CommandSource).NamingContainer;
int DemoId = Convert.ToInt32(gvdemo.DataKeys[row.RowIndex].Value);

}

}

//You will get id here.....You code goes Here....