How to assign UpdatePanel Trigger's control ID with button's from gridview in asp.net

/////////////// Some  methods are below-

1. Using Gridview RowCreated Methode

protected void Gridview_RowCreated(object sender, GridViewRowEventArgs e)

    {

        LinkButton ControlID = (LinkButton)e.Row.Cells[0].FindControl("ControlID");

        if (ControlID != null)

        {

            ScriptManager.GetCurrent(this).RegisterPostBackControl(ControlID);

        }

    }

2. Using Gridview OnRowDataboud method

  protected void Gridview_Rowdatabound(object sender, GridViewRowEventArgs e)

    {

        if (e.Row.RowType == DataControlRowType.DataRow)

        {

            ImageButton ControlID = e.Row.FindControl("ControlID") as ImageButton;

            ScriptManager.GetCurrent(this).RegisterPostBackControl(ControlID);

        }

    }

3. Using For or Foreach loop

   private void Assign_PostBackControl(GridView Grd)

    {

        foreach (GridViewRow row in Grd.Rows)

        {

            LinkButton lnkFull = row.FindControl("ControlID") as LinkButton;

            ScriptManager.GetCurrent(this).RegisterPostBackControl(lnkFull);

        }

    }