private T GetRepeaterItemValue<T>(RepeaterItem item, string controlId)
   {
       T controlValue = default(T);
 
       if (item != null && !String.IsNullOrEmpty(controlId))
       {
           var control = item.FindControl(controlId);
 
           if (control is DropDownList)
           {
               controlValue = (T)Convert.ChangeType(((DropDownList)control).SelectedValue, typeof(T));
           }
           else if (control is TextBox)
           {
               controlValue = (T)Convert.ChangeType(String.IsNullOrEmpty(((TextBox)control).Text) ? String.Empty : ((TextBox)control).Text.Trim(), typeof(T));
           }
           else if (control is HiddenField)
           {
               controlValue = (T)Convert.ChangeType(((HiddenField)control).Value, typeof(T));
           }
       }
 
       return controlValue;
   }