Limit Repeater Rows when Adding (Inserting) row programmatically in ASP.Net using C# and VB.Net

Hi Tevin,

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

HTML

<asp:Repeater ID="rpAddedWights" runat="server">
    <HeaderTemplate>
        <table class="table table-striped table-bordered table-hover table-condensed" border="1">
            <thead>
                <tr>
                    <th>Part Weight (g)</th>
                    <th>Sprue Weight (g)</th>
                </tr>
            </thead>
            <tbody>
    </HeaderTemplate>
    <ItemTemplate>
        <tr runat="server">
            <td><asp:Label Text='<%#DataBinder.Eval(Container.DataItem, "PartWeight")%>' runat="server" ID="lblPartWeight" /></td>
            <td><asp:Label Text='<%#DataBinder.Eval(Container.DataItem, "SprueWeight")%>' runat="server" ID="lblSprueWeight" /></td>
        </tr>
    </ItemTemplate>
    <FooterTemplate>
        </tbody>
        </table>
    </FooterTemplate>
</asp:Repeater>
<hr />
<table class="table table-striped table-bordered table-hover table-condensed" border="1">
    <tr>
        <td style="padding-bottom: 10px">Part Weight:<br />
            <asp:TextBox ID="txtPartWeight" runat="server" />
        </td>
    </tr>
    <tr>
        <td style="padding-bottom: 10px">Sprue Weight:<br />
            <asp:TextBox ID="txtSprueWeight" runat="server" />
        </td>
    </tr>
    <tr>
        <td style="width: 100px">
            <asp:Button ID="btnAdd" runat="server" Text="Add" OnClick="btnAdd_Click" />
        </td>
    </tr>
</table>

Namespaces

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[2] {
            new DataColumn("PartWeight"), new DataColumn("SprueWeight") });
        ViewState["Weights"] = dt;
        this.BindRepeater();
    }
}

protected void BindRepeater()
{
    rpAddedWights.DataSource = (DataTable)ViewState["Weights"];
    rpAddedWights.DataBind();
}

protected void btnAdd_Click(object sender, EventArgs e)
{
    DataTable dt = (DataTable)ViewState["Weights"];
    if (dt.Rows.Count < 5)
    {
        dt.Rows.Add(txtPartWeight.Text.Trim(), txtSprueWeight.Text.Trim());
        ViewState["Customers"] = dt;
        this.BindRepeater();
    }
    else
    {
        ClientScript.RegisterClientScriptBlock(this.GetType(), "", "alert('You have reached the limit of rows added.')", true);
    }
    txtPartWeight.Text = string.Empty;
    txtSprueWeight.Text = string.Empty;
}

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(1) {
                            New DataColumn("PartWeight"), New DataColumn("SprueWeight")})
        ViewState("Weights") = dt
        Me.BindRepeater()
    End If
End Sub

Protected Sub BindRepeater()
    rpAddedWights.DataSource = CType(ViewState("Weights"), DataTable)
    rpAddedWights.DataBind()
End Sub

Protected Sub btnAdd_Click(ByVal sender As Object, ByVal e As EventArgs)
    Dim dt As DataTable = CType(ViewState("Weights"), DataTable)

    If dt.Rows.Count < 5 Then
        dt.Rows.Add(txtPartWeight.Text.Trim(), txtSprueWeight.Text.Trim())
        ViewState("Customers") = dt
        Me.BindRepeater()
    Else
        ClientScript.RegisterClientScriptBlock(Me.GetType(), "", "alert('You have reached the limit of rows added.')", True)
    End If

    txtPartWeight.Text = String.Empty
    txtSprueWeight.Text = String.Empty
End Sub