Access Inner (nested) Repeater control in ItemDataBound event using C# and VB.Net in ASP.Net

Hi NisarKhan,

Refer below sample code.

HTML

<table>
    <asp:Repeater ID="OuterRepeater" runat="server" OnItemDataBound="OuterRepeater_ItemDataBound">
        <ItemTemplate>
            <tr>
                <td class="style3">
                    <%# Eval("StudentID") %>
                </td>
                <td class="style4">
                    <%# Eval("Name") %>&nbsp;
                </td>
                <asp:HiddenField ID="hfStudentID" runat="server" Value='<%#Eval("StudentID")%>' />
                <asp:Repeater ID="InnerRepeaterCourseResults" runat="server" OnItemDataBound="InnerRepeaterCourseResults_ItemDataBound">
                    <ItemTemplate>
                        <td class="style31" colspan="0" align="center">
                            <table border="Black" width="100%" style="border: 0px" align="center">
                                <td align="center">
                                    <asp:Label ID="lblcourse" runat="server" Text='<%# Eval("ObtainedMarks") %>' ForeColor="#0066FF"
                                        CssClass="test"></asp:Label>
                                </td>
                            </table>
                        </td>
                    </ItemTemplate>
                </asp:Repeater>
            </tr>
            <asp:Literal ID="litTotal" runat="server"></asp:Literal>
        </ItemTemplate>
    </asp:Repeater>
</table>

Namespaces

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

DataTable dt = new DataTable();
protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        dt.Columns.AddRange(new DataColumn[] { new DataColumn("StudentID", typeof(int)), new DataColumn("Name", typeof(string)), new DataColumn("ObtainedMarks", typeof(int)) });
        dt.Rows.Add(1, "A", 100);
        dt.Rows.Add(2, "B", 200);
        dt.Rows.Add(3, "C", 300);
        OuterRepeater.DataSource = dt;
        OuterRepeater.DataBind();
    }
}

protected void OuterRepeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        string id = (e.Item.FindControl("hfStudentID") as HiddenField).Value;
        Repeater InnerRepeaterCourseResults = e.Item.FindControl("InnerRepeaterCourseResults") as Repeater;
        InnerRepeaterCourseResults.DataSource = dt.Select("StudentID=" + id + "").CopyToDataTable();
        InnerRepeaterCourseResults.DataBind();
    }
}

protected void InnerRepeaterCourseResults_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        Repeater repeater = (Repeater)sender;
        RepeaterItem item = (RepeaterItem)repeater.NamingContainer;
        (item.FindControl("litTotal") as Literal).Text = (e.Item.FindControl("lblcourse") as Label).Text;
    }
}

VB.Net

Private dt As DataTable = New DataTable()
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    If Not Me.IsPostBack Then
        dt.Columns.AddRange(New DataColumn() {New DataColumn("StudentID", GetType(Integer)), New DataColumn("Name", GetType(String)), New DataColumn("ObtainedMarks", GetType(Integer))})
        dt.Rows.Add(1, "A", 100)
        dt.Rows.Add(2, "B", 200)
        dt.Rows.Add(3, "C", 300)
        OuterRepeater.DataSource = dt
        OuterRepeater.DataBind()
    End If
End Sub

Protected Sub OuterRepeater_ItemDataBound(ByVal sender As Object, ByVal e As RepeaterItemEventArgs)
    If e.Item.ItemType = ListItemType.Item OrElse e.Item.ItemType = ListItemType.AlternatingItem Then
        Dim id As String = (TryCast(e.Item.FindControl("hfStudentID"), HiddenField)).Value
        Dim InnerRepeaterCourseResults As Repeater = TryCast(e.Item.FindControl("InnerRepeaterCourseResults"), Repeater)
        InnerRepeaterCourseResults.DataSource = dt.[Select]("StudentID=" & id & "").CopyToDataTable()
        InnerRepeaterCourseResults.DataBind()
    End If
End Sub

Protected Sub InnerRepeaterCourseResults_ItemDataBound(ByVal sender As Object, ByVal e As RepeaterItemEventArgs)
    If e.Item.ItemType = ListItemType.Item OrElse e.Item.ItemType = ListItemType.AlternatingItem Then
        Dim repeater As Repeater = CType(sender, Repeater)
        Dim item As RepeaterItem = CType(repeater.NamingContainer, RepeaterItem)
        TryCast(item.FindControl("litTotal"), Literal).Text = (TryCast(e.Item.FindControl("lblcourse"), Label)).Text
    End If
End Sub