Unable to find visible property using reflection when using ajax request(Expert advice needed)

   var xhr = false;
   if (window.XMLHttpRequest) { xhr = new XMLHttpRequest(); }
   else { xhr = new ActiveXObject("Microsoft.XMLHTTP"); }
   xhr.onreadystatechange = function () {
      if (xhr.readyState == 4 && xhr.status == 200) {
         var grid = $("#grid1");
         grid.parentNode.innerHTML = xhr.responseText;
      }
   }
   
   var url = "jquegrid.aspx";
   xhr.open("POST", url, false);

   xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
   //xhr.setRequestHeader("IsLookup", "true");
   xhr.send(sendData);
   return false;
}

public List<PropertyInfo> GetPropertyListFromGrid<T2>(GridView objGrid)
{
   List<PropertyInfo> lsproperties = new List<PropertyInfo>();
          
   int columnIndex = -1;
   foreach (TableCell cell in objGrid.Rows[2].Cells)
   {
      columnIndex++;
      foreach (Control childControl in cell.Controls)
      {
         Type type = childControl.GetType();

         string CtrlName = type.Name;
         if (CtrlName == "TextBox" || CtrlName == "CheckBox")
         {
            bool isEnabled = (bool)type.GetProperty("Enabled").GetValue(childControl, null);
            bool isVisible = (bool)type.GetProperty("Visible").GetValue(childControl, null);
               
            if (isEnabled && isVisible )
            {
               //do something
            }
         }
      }
   }
          
   return lsproperties;
}