Validate at least one RadioButton is selected from each ASP.Net Repeater Item using C# and VB.Net

Hi ramco1917,

Please refer below sample.

HTML

<asp:Repeater ID="rptQuestionsEmp" runat="server" OnItemDataBound="OnItemDataBound">
    <HeaderTemplate>
        <table >
            <tr>
                <th>#</th>
                <th>Question</th>
                <th>Options</th>
            </tr>
    </HeaderTemplate>
    <ItemTemplate>
        <tr>
            <td>Question
                <asp:Label ID="lblQuestionId" runat="server" Text='<%# Eval("QuestionId") %>' />:</td>
            <td>
                <asp:HiddenField ID="hfQuestionID" runat="server" Value='<%#Eval("QuestionId")%>' />
                <asp:Label ID="lblQuestion" runat="server" Text='<%# Eval("Question") %>' /></td>
            </td>   
            <td>
                <asp:Repeater ID="rptAnswersEmp" runat="server">
                    <HeaderTemplate>
                        <table>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <tr>
                            <td>
                                <asp:RadioButton ID="rbtnOpt1" runat="server" Text='<%# Eval("Option1") %>' GroupName="G1" /><br />
                                <asp:RadioButton ID="rbtnOpt2" runat="server" Text='<%# Eval("Option2") %>' GroupName="G1" /><br />
                                <asp:RadioButton ID="rbtnOpt3" runat="server" Text='<%# Eval("Option3") %>' GroupName="G1" /><br />
                                <asp:RadioButton ID="rbtnOpt4" runat="server" Text='<%# Eval("Option4") %>' GroupName="G1" />
                            </td>
                        </tr>
                    </ItemTemplate>
                    <FooterTemplate>
                        </table> 
                    </FooterTemplate>
                </asp:Repeater>
            </td>
        </tr>
    </ItemTemplate>
    <FooterTemplate>
        </table>
    </FooterTemplate>
</asp:Repeater>
<asp:Button ID="btnSave" Text="Save" runat="server" OnClick="Save"/>

Namespaces

C#

using System.Configuration;
using System.Data;
using System.Data.SqlClient;

VB.Net

Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        rptQuestionsEmp.DataSource = GetData("SELECT QuestionId, Question FROM QuestionToEmpoyees");
        rptQuestionsEmp.DataBind();
    }
}

private static DataTable GetData(string query)
{
    string constring = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constring))
    {
        using (SqlCommand cmd = new SqlCommand())
        {
            cmd.CommandText = query;
            using (SqlDataAdapter sda = new SqlDataAdapter())
            {
                cmd.Connection = con;
                sda.SelectCommand = cmd;
                using (DataSet ds = new DataSet())
                {
                    DataTable dt = new DataTable();
                    sda.Fill(dt);
                    return dt;
                }
            }
        }
    }
}

protected void OnItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        string questionId = (e.Item.FindControl("hfquestionId") as HiddenField).Value;
        Repeater rptAnswersEmp = e.Item.FindControl("rptAnswersEmp") as Repeater;

        rptAnswersEmp.DataSource = GetData(string.Format("SELECT * FROM QuestionToEmpoyees WHERE QuestionId='{0}'", questionId));
        rptAnswersEmp.DataBind();
    }
}

protected void Save(object sender, EventArgs e)
{
    foreach (RepeaterItem item in rptQuestionsEmp.Items)
    {
        Repeater rptAns = item.FindControl("rptAnswersEmp") as Repeater;
        foreach (RepeaterItem item1 in rptAns.Items)
        {
            bool option1 = (item1.FindControl("rbtnOpt1") as RadioButton).Checked;
            bool option2 = (item1.FindControl("rbtnOpt2") as RadioButton).Checked;
            bool option3 = (item1.FindControl("rbtnOpt3") as RadioButton).Checked;
            bool option4 = (item1.FindControl("rbtnOpt4") as RadioButton).Checked;
            if (option1 || option2 || option3 || option4)
            {
                // Do rest of Task.
            }
            else
            {
                ClientScript.RegisterStartupScript(this.GetType(), "message", "alert('Select one option from each question.');", true);
                return;
            }
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        rptQuestionsEmp.DataSource = GetData("SELECT QuestionId, Question FROM QuestionToEmpoyees")
        rptQuestionsEmp.DataBind()
    End If
End Sub

Private Shared Function GetData(ByVal query As String) As DataTable
    Dim constring As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As SqlConnection = New SqlConnection(constring)
        Using cmd As SqlCommand = New SqlCommand()
            cmd.CommandText = query
            Using sda As SqlDataAdapter = New SqlDataAdapter()
                cmd.Connection = con
                sda.SelectCommand = cmd
                Using ds As DataSet = New DataSet()
                    Dim dt As DataTable = New DataTable()
                    sda.Fill(dt)
                    Return dt
                End Using
            End Using
        End Using
    End Using
End Function

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 questionId As String = (TryCast(e.Item.FindControl("hfquestionId"), HiddenField)).Value
        Dim rptAnswersEmp As Repeater = TryCast(e.Item.FindControl("rptAnswersEmp"), Repeater)
        rptAnswersEmp.DataSource = GetData(String.Format("SELECT * FROM QuestionToEmpoyees WHERE QuestionId='{0}'", questionId))
        rptAnswersEmp.DataBind()
    End If
End Sub

Protected Sub Save(ByVal sender As Object, ByVal e As EventArgs)
    For Each item As RepeaterItem In rptQuestionsEmp.Items
        Dim rptAns As Repeater = TryCast(item.FindControl("rptAnswersEmp"), Repeater)

        For Each item1 As RepeaterItem In rptAns.Items
            Dim option1 As Boolean = (TryCast(item1.FindControl("rbtnOpt1"), RadioButton)).Checked
            Dim option2 As Boolean = (TryCast(item1.FindControl("rbtnOpt2"), RadioButton)).Checked
            Dim option3 As Boolean = (TryCast(item1.FindControl("rbtnOpt3"), RadioButton)).Checked
            Dim option4 As Boolean = (TryCast(item1.FindControl("rbtnOpt4"), RadioButton)).Checked

            If option1 OrElse option2 OrElse option3 OrElse option4 Then
            Else
                ClientScript.RegisterStartupScript(Me.[GetType](), "message", "alert('Select one option from each question.');", True)
                Return
            End If
        Next
    Next
End Sub

Screenshot