SetFocus in eine Textbox - ASP.NET

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private void Page_Load(object sender, EventArgs e)
{
  //Hier gibt man die gewünschte TextBox an.
  SetFocus(TextBox);
}


private void SetFocus(Control ctrl)
{
  StringBuilder sb = new StringBuilder(100);
  sb.Append("<script language=\"javascript\">\r\n");
  sb.Append("<!--\r\n");
  sb.Append("document.getElementById('");
  sb.Append(ctrl.ClientID);
  sb.Append("').focus();\r\n");
  sb.Append("-->\r\n");
  sb.Append("</script>\r\n");
  this.Page.RegisterStartupScript("SetFocus", sb.ToString());
}