i have implemented Web Hirachical Data Grid with N Level of childs . on Save Button i need to get the Checked and unchecked Child bands in code Behind but i am getting 0 count on  WebHierarchicalDataGrid1.GridView.Rows[row.Index].RowIslands. 

My Code Behind code is :

protected void WebHierarchicalDataGrid1_RowIslandDataBound(object sender, RowIslandEventArgs e)
{
if (hdgEnterExit.GridView.Rows[0].RowIslands.Count > 0)
{
var childGrid2 = hdgEnterExit.GridView.Rows[0].RowIslands[0];

foreach (GridRecord record in childGrid2.Rows)
{
var c = record.Items[0].FindControl("chkChon") as CheckBox;

if (c != null && c.Checked)
{

}
// userListId += record.Items[1].Value + ";";
}
}

}

protected void btnSaveAccessGrid_Click(object sender, EventArgs e)
{

foreach (GridRecord row in hdgEnterExit.Rows)
{
// var b = row.Items[0].FindControl("chkChon") as CheckBox;

// Get row island using data member
if (hdgEnterExit.GridView.Rows[row.Index].RowIslands != null &&
hdgEnterExit.GridView.Rows[row.Index].RowIslands.Count > 0)
{
var childGrid2 = hdgEnterExit.GridView.Rows[row.Index].RowIslands[0];

foreach (GridRecord record in childGrid2.Rows)
{
var c = record.Items[0].FindControl("Operation") as CheckBox;

if (record.Items[2].Value.Equals("thuynt.bic"))
{
string x = "1";
}
if (c != null && c.Checked)
{

}
//userListId += record.Items[1].Value + ";";
}
}

}

int count = hdgEnterExit.Rows.Count;

for (int i = 0; i < count; i++)
{
var a = hdgEnterExit.Bands.FindByDataMember("TRN_CODE").Columns.FromKey("Menu_Label");
//var Bands = hdgEnterExit.Rows[i].Items.Grid.DataKeyFields().;
// var row = hdgEnterExit.getChildRow

// if (Convert.ToBoolean(hdgEnterExit.Rows[i].Items.FindItemByKey("Menu_Label").Value) == true)
//{

//POST[j] = Convert.ToBoolean(grdPay.Rows[i].Items.FindItemByKey("All_Post_Checkbox").Value) == true ? 1 : 0;
//Status[j] = 1; // processed
//ParticipantCode[j] = Convert.ToString(grdPay.Rows[i].Items.FindItemByKey("PARTICIPANT_CODE").Value);

//System.Globalization.CultureInfo culture = new System.Globalization.CultureInfo("en-GB");
////SettlementDate[j] = DateTime.Parse( grdPay.Rows[i].Items.FindItemByKey("SETTLEMENT_DATE").Value.ToString());
////SettlementDate[j] = Convert.ToDateTime()
//SettlementDate[j] = Convert.ToDateTime(grdPay.Rows[i].Items.FindItemByKey("SETTLEMENT_DATE").Value.ToString(), culture);
//ProcessedDate[j] = GetSystemDate();
//IsMannual[j] = 1;
//LogID[j] = Log_ID;
//RefNumber[j] = SystemUtil.GetNextRefNo(CurrentRefernceNumber);
//CurrentRefernceNumber = RefNumber[j];
//j = j + 1;

// }

}

}

 and on Front Side :

<ig:WebHierarchicalDataGrid ID="hdgEnterExit" runat="server" EnableRelativeLayout="True" ShowFooter="False" HeaderCaptionCssClass="HeaderCaptionClass" ItemCssClass="ItemCssClass"
AltItemCssClass="AltItemCssClass" FooterCaptionCssClass="HeaderCaptionClass" AutoGenerateColumns="False" AutoGenerateBands="True"
DataMember="Module"
DataKeyFields="Module_Id"
InitialDataBindDepth="-1"
Width="860px"
EnableDataViewState="true" EnableViewState="true" OnRowIslandDataBound="WebHierarchicalDataGrid1_RowIslandDataBound">

<Columns>
<ig:BoundDataField DataFieldName="Module_Id" Key="Module_Id" Footer-Text="Module_Id" Header-Text="Module_Id" CssClass="CenterAlign" Width="70">
</ig:BoundDataField>
</Columns>
<Columns>
<ig:BoundDataField DataFieldName="Module_Label" Key="Module_Label" Footer-Text="Module_Label" Header-Text="Module_Label" CssClass="CenterAlign" Width="120">
</ig:BoundDataField>
</Columns>

<Bands>
<ig:Band Key="Trn_Id" AutoGenerateColumns="false" DataMember="TRN_CODE" DataKeyFields="Trn_Id">
<Columns>
<ig:BoundDataField DataFieldName="Menu_Label" Key="Menu_Label" Header-Text="Menu_Label" CssClass="CenterAlign" Width="520">
</ig:BoundDataField>
</Columns>

<Bands>
<ig:Band Key="Trn_Id" AutoGenerateColumns="false" DataMember="TRN_Operations" DataKeyFields="Trn_Id,Operation_Id">
<Columns>
<ig:BoundDataField DataFieldName="Operation_Id" Key="Operation_Id" Header-Text="Operation_Id" CssClass="CenterAlign" Width="420">
</ig:BoundDataField>
<ig:BoundCheckBoxField DataFieldName="Operation" DataType="System.Boolean"
VisibleIndex="1" Key="Operation" Width="180px">
<Header Text="Operation" >

</Header>
</ig:BoundCheckBoxField>
</Columns>
<Bands>
</Bands>
</ig:Band>
</Bands>
</ig:Band>
</Bands>
<Behaviors>
<ig:EditingCore EnableInheritance="True" Enabled="true">
<EditingClientEvents CellValueChanging="WebHierarchicalDataGrid1_Editing_CellValueChanging"/>
<Behaviors>
<ig:CellEditing EnableInheritance="true">
<EditModeActions EnableOnActive="True" MouseClick="Single" />
</ig:CellEditing>
</Behaviors>
</ig:EditingCore>
</Behaviors>
</ig:WebHierarchicalDataGrid>