Dynamically created image button click event is not fired

Question

On grid RowDataBound based on some condition i've added imagebutton dynamically. parallelly i want to add event for this button click. here is my code snippet

 

protected void GV3_RowDataBound(object sender, GridViewRowEventArgs e)     

{ 

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

{                 

TableCell cell = new TableCell();                 

ImageButton bttn = new ImageButton();                 

bttn.CommandName = "Delete";                 

bttn.ImageUrl = "delete.png";                 

bttn.ToolTip = "Click to delete this record";                 

bttn.CommandArgument = e.Row.Cells[0].Text;                 

cell.Controls.Add(bttn);                 

e.Row.Cells.Add(cell);                 

bttn.OnClientClick = "return confirm('Are you sure you to delete " + e.Row.Cells[0].Text + "?');"; 

} 

}

 That message popup box comes, but i'm unable to catch that click event. while click on a row i want to delete that row, so want to create event dynamically. for that i've used this following dynamic click event

 

bttn.Click += new ImageClickEventHandler(b_Click);   

private void b_Click(object sender, EventArgs e)     

{ //delete record 

}

 but this above code also not working. Please help me to solve this. Thanks in advance.