Pass (Send) GridView checked cell value using StringBuilder in ASP.Net using C# and VB.Net

Hi suhaas121,

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

HTML

<asp:GridView ID="GridView1" runat="server">
    <Columns>
        <asp:TemplateField>
            <EditItemTemplate>
                <asp:CheckBox ID="CheckBox1" runat="server" />
            </EditItemTemplate>
            <ItemTemplate>
                <asp:CheckBox ID="CheckBox1" runat="server" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>
<asp:Button ID="btnadd" OnClick="btnadd_Click" runat="server" Text="Add To Cart" />

Namespaces

C#

using System.Data;
using System.Text;

VB.Net

Imports System.Data
Imports System.Text

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] {
            new DataColumn("Id"), new DataColumn("Name"), new DataColumn("Country") });
        dt.Rows.Add(1, "John Hammond", "United States");
        dt.Rows.Add(2, "Mudassar Khan", "India");
        dt.Rows.Add(3, "Suzanne Mathews", "France");
        dt.Rows.Add(4, "Robert Schidner", "Russia");
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }
}

protected void btnadd_Click(object sender, EventArgs e)
{
    StringBuilder strb = new StringBuilder();
    for (int i = 0; i < GridView1.Rows.Count; i++)
    {
        GridViewRow row = GridView1.Rows[i];
        bool isChecked = ((CheckBox)row.FindControl("CheckBox1")).Checked;
        if (isChecked)
        {
            strb.Append(GridView1.Rows[i].Cells[1].Text).AppendLine();
        }
    }
    Session["vendor"] = strb.ToString().Trim();
    Response.Redirect("Order.aspx");
}

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(2) {
                            New DataColumn("Id"), New DataColumn("Name"), New DataColumn("Country")})
        dt.Rows.Add(1, "John Hammond", "United States")
        dt.Rows.Add(2, "Mudassar Khan", "India")
        dt.Rows.Add(3, "Suzanne Mathews", "France")
        dt.Rows.Add(4, "Robert Schidner", "Russia")
        GridView1.DataSource = dt
        GridView1.DataBind()
    End If
End Sub

Protected Sub btnadd_Click(ByVal sender As Object, ByVal e As EventArgs)
    Dim strb As StringBuilder = New StringBuilder()
    For i As Integer = 0 To GridView1.Rows.Count - 1
        Dim row As GridViewRow = GridView1.Rows(i)
        Dim isChecked As Boolean = (CType(row.FindControl("CheckBox1"), CheckBox)).Checked
        If isChecked Then
            strb.Append(GridView1.Rows(i).Cells(1).Text).AppendLine()
        End If
    Next

    Session("vendor") = strb.ToString().Trim()
    Response.Redirect("Order.aspx")
End Sub

Order Page

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (Session["vendor"] != null)
    {
        string[] vendors = Session["vendor"].ToString().Split('\n');
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Session("vendor") IsNot Nothing Then
        Dim vendors As String() = Session("vendor").ToString().Split(vbLf)
    End If
End Sub