Dynamically Add Remove Rows in Repeater using C# and VB.Net in ASP.Net

Hi careless,

Check this example. Now please take its reference and correct your code.

HTML

<asp:Repeater ID="Repeater1" runat="server">
    <HeaderTemplate>
        <div class="row">
            <div class="col-md-2">
                <asp:Label ID="Label1" runat="server" Text="Name"></asp:Label>
            </div>
            <div class="col-md-2">
                <asp:Label ID="Label2" runat="server" Text="Email"></asp:Label>
            </div>
            <div class="col-md-2">
                <asp:Label ID="Label3" runat="server" Text="Mobile"></asp:Label>
            </div>
        </div>
    </HeaderTemplate>
    <ItemTemplate>
        <div class="row">
            <div class="col-md-2">
                <asp:TextBox ID="txtname" runat="server" CssClass="form-control"></asp:TextBox>
            </div>
            <div class="col-md-2">
                <asp:TextBox ID="txtemail" runat="server" CssClass="form-control"></asp:TextBox>
            </div>
            <div class="col-md-2">
                <asp:TextBox ID="txtmobile" runat="server" CssClass="form-control"></asp:TextBox>
            </div>
            <div class="col-sm-1">
                <asp:LinkButton ID="btnadd" runat="server" Text="+" CssClass="btn btn-success" OnClick="btnadd_Click"></asp:LinkButton>
            </div>
            <div class="col-sm-1" style="float: left">
                <asp:LinkButton ID="btndel" runat="server" Text="-" CssClass="btn btn-danger left"
                    OnClick="btndel_Click"></asp:LinkButton>
            </div>
        </div>
        <br />
    </ItemTemplate>
</asp:Repeater>

Namespaces

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindRepeater();
    }
}

protected void btnadd_Click(object sender, EventArgs e)
{
    int rowIndex = 0;

    if (ViewState["Curtbl"] != null)
    {
        DataTable dt = (DataTable)ViewState["Curtbl"];
        DataRow drCurrentRow = null;
        if (dt.Rows.Count > 0)
        {
            for (int i = 1; i <= dt.Rows.Count; i++)
            {
                TextBox txtname = (TextBox)Repeater1.Items[rowIndex].FindControl("txtname");
                TextBox txtemail = (TextBox)Repeater1.Items[rowIndex].FindControl("txtemail");
                TextBox txtmobile = (TextBox)Repeater1.Items[rowIndex].FindControl("txtmobile");
                drCurrentRow = dt.NewRow();
                dt.Rows[i - 1]["txtname"] = txtname.Text;
                dt.Rows[i - 1]["txtemail"] = txtemail.Text;
                dt.Rows[i - 1]["txtmobile"] = txtmobile.Text;
                rowIndex++;
            }
            dt.Rows.Add(drCurrentRow);
            ViewState["Curtbl"] = dt;
            Repeater1.DataSource = dt;
            Repeater1.DataBind();
        }
    }
    else
    {
        Response.Write("ViewState Value is Null");
    }
    SetOldData();
}

protected void btndel_Click(object sender, EventArgs e)
{
    RepeaterItem item = (sender as LinkButton).NamingContainer as RepeaterItem;

    int rowIndex = 0;
    int rowID = item.ItemIndex;
    if (ViewState["Curtbl"] != null)
    {
        DataTable dt = (DataTable)ViewState["Curtbl"];
        if (dt.Rows.Count > 0)
        {
            for (int i = 1; i <= Repeater1.Items.Count; i++)
            {
                TextBox txtname = (TextBox)Repeater1.Items[rowIndex].FindControl("txtname");
                TextBox txtemail = (TextBox)Repeater1.Items[rowIndex].FindControl("txtemail");
                TextBox txtmobile = (TextBox)Repeater1.Items[rowIndex].FindControl("txtmobile");
                dt.Rows[i - 1]["txtname"] = txtname.Text;
                dt.Rows[i - 1]["txtemail"] = txtemail.Text;
                dt.Rows[i - 1]["txtmobile"] = txtmobile.Text;
                rowIndex++;
            }

            if (item.ItemIndex < dt.Rows.Count - 1)
            {
                dt.Rows.Remove(dt.Rows[rowID]);
            }
        }

        ViewState["Curtbl"] = dt;
        Repeater1.DataSource = dt;
        Repeater1.DataBind();
    }

    SetOldData();
}

protected void BindRepeater()
{
    DataTable dt = new DataTable();
    dt.Columns.Add("txtname", typeof(string));
    dt.Columns.Add("txtemail", typeof(string));
    dt.Columns.Add("txtmobile", typeof(string));
    DataRow dr = dt.NewRow();
    dr["txtname"] = string.Empty;
    dr["txtemail"] = string.Empty;
    dr["txtmobile"] = string.Empty;
    dt.Rows.Add(dr);
    ViewState["Curtbl"] = dt;
    Repeater1.DataSource = dt;
    Repeater1.DataBind();

}

private void SetOldData()
{
    int rowIndex = 0;
    if (ViewState["Curtbl"] != null)
    {
        DataTable dt = (DataTable)ViewState["Curtbl"];
        if (dt.Rows.Count > 0)
        {
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                TextBox txtname = (TextBox)Repeater1.Items[rowIndex].FindControl("txtname");
                TextBox txtemail = (TextBox)Repeater1.Items[rowIndex].FindControl("txtemail");
                TextBox txtmobile = (TextBox)Repeater1.Items[rowIndex].FindControl("txtmobile");
                txtname.Text = dt.Rows[i]["txtname"].ToString();
                txtemail.Text = dt.Rows[i]["txtemail"].ToString();
                txtmobile.Text = dt.Rows[i]["txtmobile"].ToString();
                rowIndex++;
            }
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        BindRepeater()
    End If
End Sub

Protected Sub btnadd_Click(ByVal sender As Object, ByVal e As EventArgs)
    Dim rowIndex As Integer = 0
    If ViewState("Curtbl") IsNot Nothing Then
        Dim dt As DataTable = CType(ViewState("Curtbl"), DataTable)
        Dim drCurrentRow As DataRow = Nothing
        If dt.Rows.Count > 0 Then
            For i As Integer = 1 To dt.Rows.Count
                Dim txtname As TextBox = CType(Repeater1.Items(rowIndex).FindControl("txtname"), TextBox)
                Dim txtemail As TextBox = CType(Repeater1.Items(rowIndex).FindControl("txtemail"), TextBox)
                Dim txtmobile As TextBox = CType(Repeater1.Items(rowIndex).FindControl("txtmobile"), TextBox)
                drCurrentRow = dt.NewRow()
                dt.Rows(i - 1)("txtname") = txtname.Text
                dt.Rows(i - 1)("txtemail") = txtemail.Text
                dt.Rows(i - 1)("txtmobile") = txtmobile.Text
                rowIndex += 1
            Next

            dt.Rows.Add(drCurrentRow)
            ViewState("Curtbl") = dt
            Repeater1.DataSource = dt
            Repeater1.DataBind()
        End If
    Else
        Response.Write("ViewState Value is Null")
    End If
    SetOldData()
End Sub

Protected Sub btndel_Click(ByVal sender As Object, ByVal e As EventArgs)
    Dim item As RepeaterItem = TryCast((TryCast(sender, LinkButton)).NamingContainer, RepeaterItem)
    Dim rowIndex As Integer = 0
    Dim rowID As Integer = item.ItemIndex
    If ViewState("Curtbl") IsNot Nothing Then
        Dim dt As DataTable = CType(ViewState("Curtbl"), DataTable)
        If dt.Rows.Count > 0 Then
            For i As Integer = 1 To Repeater1.Items.Count
                Dim txtname As TextBox = CType(Repeater1.Items(rowIndex).FindControl("txtname"), TextBox)
                Dim txtemail As TextBox = CType(Repeater1.Items(rowIndex).FindControl("txtemail"), TextBox)
                Dim txtmobile As TextBox = CType(Repeater1.Items(rowIndex).FindControl("txtmobile"), TextBox)
                dt.Rows(i - 1)("txtname") = txtname.Text
                dt.Rows(i - 1)("txtemail") = txtemail.Text
                dt.Rows(i - 1)("txtmobile") = txtmobile.Text
                rowIndex += 1
            Next
            If item.ItemIndex < dt.Rows.Count - 1 Then
                dt.Rows.Remove(dt.Rows(rowID))
            End If
        End If
        ViewState("Curtbl") = dt
        Repeater1.DataSource = dt
        Repeater1.DataBind()
    End If

    SetOldData()
End Sub

Protected Sub BindRepeater()
    Dim dt As DataTable = New DataTable()
    dt.Columns.Add("txtname", GetType(String))
    dt.Columns.Add("txtemail", GetType(String))
    dt.Columns.Add("txtmobile", GetType(String))
    Dim dr As DataRow = dt.NewRow()
    dr("txtname") = String.Empty
    dr("txtemail") = String.Empty
    dr("txtmobile") = String.Empty
    dt.Rows.Add(dr)
    ViewState("Curtbl") = dt
    Repeater1.DataSource = dt
    Repeater1.DataBind()
End Sub

Private Sub SetOldData()
    Dim rowIndex As Integer = 0
    If ViewState("Curtbl") IsNot Nothing Then
        Dim dt As DataTable = CType(ViewState("Curtbl"), DataTable)
        If dt.Rows.Count > 0 Then
            For i As Integer = 0 To dt.Rows.Count - 1
                Dim txtname As TextBox = CType(Repeater1.Items(rowIndex).FindControl("txtname"), TextBox)
                Dim txtemail As TextBox = CType(Repeater1.Items(rowIndex).FindControl("txtemail"), TextBox)
                Dim txtmobile As TextBox = CType(Repeater1.Items(rowIndex).FindControl("txtmobile"), TextBox)
                txtname.Text = dt.Rows(i)("txtname").ToString()
                txtemail.Text = dt.Rows(i)("txtemail").ToString()
                txtmobile.Text = dt.Rows(i)("txtmobile").ToString()
                rowIndex += 1
            Next
        End If
    End If
End Sub

Screenshot