Set Selected Value of DropDownList inside ASP.Net Repeater using C# and VB.Net

Hi ramco1917,

Please refer below sample.

HTML

<asp:Repeater ID="rptBulkData" runat="server" OnItemDataBound="OnItemDataBound">
<HeaderTemplate>
    <table>
        <tr>
            <td>ID</td>
            <td>Break</td>
        </tr>
</HeaderTemplate>
<ItemTemplate>
    <tr>
        <td>
            <asp:HiddenField ID="hfID" runat="server" Value='<%# Eval("ID") %>' />
            <asp:HiddenField ID="hfBreak" runat="server" Value='<%# Eval("Break") %>' />
            <asp:Literal ID="ltrlNum" runat="server" Text="<%# Container.ItemIndex + 1 %>"></asp:Literal>
        </td>
        <td>
            <asp:DropDownList ID="ddlBreaks" runat="server">
                <asp:ListItem Value="1" Text="Yes"></asp:ListItem>
                <asp:ListItem Value="0" Text="No"></asp:ListItem>
            </asp:DropDownList>
        </td>
    </tr>
</ItemTemplate>
<FooterTemplate>
    </table>
</FooterTemplate>
</asp:Repeater>

Namespace

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[] {
                            new DataColumn("ID"),
                            new DataColumn("Break")});
        dt.Rows.Add("1", "0");
        dt.Rows.Add("2", "1");
        dt.Rows.Add("3", "2");
        rptBulkData.DataSource = dt;
        rptBulkData.DataBind();
    }
}

protected void OnItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        DropDownList ddlBreak = (DropDownList)e.Item.FindControl("ddlBreaks") as DropDownList;
        string breakValue = (e.Item.FindControl("hfBreak") as HiddenField).Value;
        if (ddlBreak.Items.FindByValue(breakValue) != null)
        {
            ddlBreak.Items.FindByValue(breakValue).Selected = true;
        }
        else
        {
            ddlBreak.Items.FindByValue("0").Selected = true;
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim dt As DataTable = New DataTable()
        dt.Columns.AddRange(New DataColumn() {
                            New DataColumn("ID"),
                            New DataColumn("Break")})
        dt.Rows.Add("1", "0")
        dt.Rows.Add("2", "1")
        dt.Rows.Add("3", "2")
        rptBulkData.DataSource = dt
        rptBulkData.DataBind()
    End If
End Sub

Protected Sub OnItemDataBound(ByVal sender As Object, ByVal e As RepeaterItemEventArgs)
    If e.Item.ItemType = ListItemType.Item OrElse e.Item.ItemType = ListItemType.AlternatingItem Then
        Dim ddlBreak As DropDownList = TryCast(CType(e.Item.FindControl("ddlBreaks"), DropDownList), DropDownList)
        Dim breakValue As String = (TryCast(e.Item.FindControl("hfBreak"), HiddenField)).Value
        If ddlBreak.Items.FindByValue(breakValue) IsNot Nothing Then
            ddlBreak.Items.FindByValue(breakValue).Selected = True
        Else
            ddlBreak.Items.FindByValue("0").Selected = True
        End If
    End If
End Sub

Screenshot