title: how to get a column value in radgrid on DeleteCommand event
body: <p>Hi All
  I have a radgrid like this :</p>
  
  <pre><code>&lt;cc1:RadGridCustomized ID="RadGrid1" runat="server" OnNeedDataSource="RadGridCustomized1_NeedDataSource"
      OnPreRender="RadGridCustomized1_PreRender" OnUpdateCommand="RadGridCustomized1_UpdateCommand"
      OnDeleteCommand="RadGridCustomized1_DeleteCommand" OnInsertCommand="RadGridCustomized1_InsertCommand"
      OnItemCreated="RadGridCustomized1_OnItemCreated"&gt;
      &lt;MasterTableView DataKeyNames="ID"&gt;
          &lt;Columns&gt;
              &lt;telerik:GridTemplateColumn HeaderText="گروه آزمایش" Visible="false"&gt;
                  &lt;ItemTemplate&gt;
                      &lt;%# Eval("HSEWaterExamGroupName") %&gt;
                  &lt;/ItemTemplate&gt;
                  &lt;EditItemTemplate&gt;
                      &lt;telerik:RadComboBox OnDataBinding="RadGridCustomized1_ccbBinding3" runat="server"
                          ID="cbbHSEWaterExamsBaseGroup"&gt;
                      &lt;/telerik:RadComboBox&gt;
                  &lt;/EditItemTemplate&gt;
              &lt;/telerik:GridTemplateColumn&gt;
              &lt;telerik:GridTemplateColumn HeaderText="نام ماده/ آزمایش" UniqueName="materialName"&gt;
                  &lt;ItemTemplate&gt;
                      &lt;%# Eval("HSEWaterExamBaseName") %&gt;
                  &lt;/ItemTemplate&gt;
                  &lt;EditItemTemplate&gt;
                      &lt;telerik:RadComboBox OnDataBinding="RadGridCustomized1_ccbBinding4" runat="server"
                          ID="cbbName"&gt;
                      &lt;/telerik:RadComboBox&gt;
                      &lt;telerik:RadTextBox ID="txtName" Enabled="false" Visible="false" runat="server" &gt;
                    &lt;/telerik:RadTextBox&gt;
                  &lt;/EditItemTemplate&gt;
              &lt;/telerik:GridTemplateColumn&gt;
      &lt;/Columns&gt;
      &lt;/MasterTableView&gt;
  &lt;/cc1:RadGridCustomized&gt;
  </code></pre>
  
  <p>now i want get the value of column "materialName" in DeleteCommand event. 
  I use this code:</p>
  
  <pre><code>GridDataItem da = e.Item as GridDataItem;
  string name = da["materialName"].Text;
  </code></pre>
  
  <p>or this code:</p>
  
  <pre><code>  name =  RadGrid1.MasterTableView.Items[e.Item.ItemIndex]["materialName"].Text;
  </code></pre>
  
  <p>but the return value is string empty.
   plz help me if any one has idea to do this .
  thanks in advance.</p>