How to find control custom template in gridview

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C#

I dynamically created button in GridView, after the button click you want the button to be removed dynamically, but my problem seems that I could not find the control in the GrideViw.
Below is some of my codes:

1.GridView Rowdatabond that created the button

public void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)

{

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

{

PlaceHolder ph = (PlaceHolder)e.Row.FindControl("ph1");
Button bt1 = new Button();

bt1.ID = "GameCall" ;

bt1.Text = "Game Call";

bt1.CommandName = "GameCall";

bt1.EnableViewState = true;

ph.Controls.Clear();

ph.Controls.Add(bt1);



}

2.The GridView RowCommand that execute the click event
public void GridViewUserLots_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "GameCall")
{



Button bt1 = (Button)e.CommandSource;
GridViewRow row = (GridViewRow)bt1.NamingContainer;
PlaceHolder ph = (PlaceHolder)row.FindControl("ph1");

TextBox PlayerID = (TextBox)row.FindControl("PlayerId");
string PlayerId = PlayerID.Text;

if (bt1 != null)
{
the event happened here
}

ph1.Controls.Remove(bt1);

What I have tried:

I tried to use the following code to remove the button bt1

ph1.Controls.Remove(bt1);

but the button still remain.