Chancing ASPxGridView data - asp.net

Question

I would like to change my gridview data. My data type are integer, but I want to divide this data with 100 For example;
They must be;
200,00
100,00
50,00
I tried do this with OnCustomColumnDisplayText event but when I added this event it was working more than one. When open the page, many times was worked again and again. So many times I divided with 100. Can you help me, please? My codes below;
<dx:ASPxGridView ID="MainDataList" ClientInstanceName="mainDataDl" runat="server" CssClass="mainDataList"
AutoGenerateColumns="False" EnableRowsCache="false" OnDataBinding="MainDataList_DataBinding" Width="100%"
OnRowUpdating="MainDataList_RowUpdating" OnCustomColumnDisplayText="MainDataList_CustomColumnDisplayText" >
<ClientSideEvents Init="grid_Init" />
<SettingsAdaptivity AdaptivityMode="HideDataCells" HideDataCellsAtWindowInnerWidth="600"
AllowOnlyOneAdaptiveDetailExpanded="true" AllowHideDataCellsByColumnMinWidth="true" />
<EditFormLayoutProperties>
<SettingsAdaptivity AdaptivityMode="SingleColumnWindowLimit" SwitchToSingleColumnAtWindowInnerWidth="680" />
</EditFormLayoutProperties>
<SettingsEditing Mode="EditFormAndDisplayRow" EditFormColumnCount="2"/>
<Styles>
<Header ForeColor="White" BackColor="#969696" Font-Size="12px" />
<Cell Font-Size="12px" Wrap="False" />
<EditForm CssClass="editForm" />
</Styles>
<Settings ShowFilterRow="True" AutoFilterCondition="Contains" />
<Columns>
<dx:GridViewCommandColumn ShowClearFilterButton="True" VisibleIndex="0" Name="TempColumn" >
</dx:GridViewCommandColumn>
</Columns>
<SettingsPager PageSize="10" NumericButtonCount="4" Mode="ShowPager" />
<TotalSummary />
<SettingsDataSecurity AllowDelete="False" AllowEdit="True" AllowInsert="False" />
<SettingsSearchPanel Visible="false" CustomEditorID="MainDataListSearchTextBox" />
<SettingsLoadingPanel Mode="Disabled" />
<SettingsBehavior AllowFocusedRow="True" ProcessFocusedRowChangedOnServer="true" />
<SettingsCommandButton>
<ShowAdaptiveDetailButton ButtonType="Image">
</ShowAdaptiveDetailButton>
<HideAdaptiveDetailButton ButtonType="Image">
</HideAdaptiveDetailButton>
</SettingsCommandButton>
</dx:ASPxGridView>
protected void MainDataList_CustomColumnDisplayText(object sender, ASPxGridViewColumnDisplayTextEventArgs e)
{
foreach (MimasPortal.TableFieldData_1_0 tf in userSession.DetailStruct.Fields)
{
if (tf.FieldType == "MONEY")
{
DataRowView rowData = (DataRowView)MainDataList.GetRow(e.VisibleIndex);
if (rowData != null)
{
if (rowData.Row[tf.FieldName].ToString().Length > 2 && rowData.Row[tf.FieldName].ToString().IndexOf('.') < 1 && rowData.Row[tf.FieldName].ToString().IndexOf(',') < 1)
{
decimal newValue = (Convert.ToDecimal(e.GetFieldValue(tf.FieldName))) / 100;
rowData.Row[tf.FieldName] = newValue;
}
else
{
rowData.Row[tf.FieldName] = e.GetFieldValue(tf.FieldName).ToString();
}
}
}
}
}