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Place Cursor in the First Input Box Automatically

protected void Page_Load(object sender, EventArgs e)
 {    FindFirstTextBox(this); }
 private bool FindFirstTextBox(Control ctl)
 {    bool foundControl = false;
    foreach (Control child in ctl.Controls)
    {
      if (child is TextBox)
       {
         System.Text.StringBuilder script =             new System.Text.StringBuilder();
          script.AppendFormat("function findFirstControl()n{1}n document.getElementById("{0}").focus();n{2}n",             child.ID, "{", "}");
        ClientScript.RegisterClientScriptBlock(this.GetType(),"findFirstControl", script.ToString(), true);
          foundControl = true;
          break;
       }
    if (FindFirstTextBox(child))
      {
       foundControl = true;
         break;
       }
     }
  return foundControl;
 }
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