How to find the buttonclick inside gridview?

1 First we can use to find on Row command events

protected void grdBillingdata_RowCommand(object sender, GridViewCommandEventArgs e)
{
        if (e.CommandName == "DeleteData")
        {
            GridViewRow row = (GridViewRow)(((Button)e.CommandSource).NamingContainer);
            HiddenField hdnDataId = (HiddenField)row.FindControl("hdnDataId");
         }
}

2 To get the Event Firing on button click event

protected void MyButtonClick(object sender, System.EventArgs e)
{
    //Get the button that raised the event
    Button btn = (Button)sender;

    //Get the row that contains this button
    GridViewRow gvr = (GridViewRow)btn.NamingContainer;
}