Hi kankon,

Using below aticle i have created the example.

Display (Show) GridView data in RDLC report in ASP.Net using C# and VB.Net

For sending the data to popup page i am using Session and set the row which need to display in RDLC. Then in popup page bing the record to RDLC.

Refer below code.

HTML

Details

<asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="false" CssClass="Grid">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:CheckBox ID="chkSelect" runat="server" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField DataField="CustomerId" HeaderText="Customer Id" />
        <asp:BoundField DataField="ContactName" HeaderText="Contact Name" />
        <asp:BoundField DataField="City" HeaderText="City" />
        <asp:BoundField DataField="Country" HeaderText="Country" />
        <asp:TemplateField HeaderText="Print">
            <ItemTemplate>
                <asp:Button ID="btnNewWindow" runat="server" Text="Print" OnClick="OpenWindow"></asp:Button>
            </ItemTemplate>
            <ItemStyle HorizontalAlign="Center" Width="100px" />
        </asp:TemplateField>
    </Columns>
</asp:GridView>    

Default

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<rsweb:ReportViewer ID="ReportViewer1" runat="server" Width="600">
</rsweb:ReportViewer>

Namespaces

C#

using System.Data;
using System.Configuration;
using System.Data.SqlClient;
using Microsoft.Reporting.WebForms;

VB.Net

Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Imports Microsoft.Reporting.WebForms

Code

C#

Details

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        gvCustomers.DataSource = GetData("SELECT TOP 5 * FROM Customers ORDER BY NEWID()");
        gvCustomers.DataBind();
    }
}

private DataTable GetData(string query)
{
    string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    SqlCommand cmd = new SqlCommand(query);
    using (SqlConnection con = new SqlConnection(conString))
    {
        using (SqlDataAdapter sda = new SqlDataAdapter())
        {
            cmd.Connection = con;

            sda.SelectCommand = cmd;
            using (DataTable dt = new DataTable())
            {
                sda.Fill(dt);
                return dt;
            }
        }
    }
}

protected void OpenWindow(object sender, EventArgs e)
{
    Session["GridViewRow"] = (sender as Button).NamingContainer as GridViewRow;
    string url = "Default.aspx";
    string s = "window.open('" + url + "', 'popup_window', 'width=600,height=800,left=100,top=100,resizable=yes');";
    ClientScript.RegisterStartupScript(this.GetType(), "script", s, true);
}

Default

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        if (Session["GridViewRow"] != null)
        {
            Customers dsCustomers = new Customers();
            GridViewRow row = Session["GridViewRow"] as GridViewRow;
            string customerId = row.Cells[1].Text;
            string contactName = row.Cells[2].Text;
            string city = row.Cells[3].Text;
            string country = row.Cells[4].Text;
            dsCustomers.Tables[0].Rows.Add(row.Cells[1].Text, row.Cells[2].Text, row.Cells[3].Text, row.Cells[4].Text);
            ReportViewer1.ProcessingMode = ProcessingMode.Local;
            ReportViewer1.LocalReport.ReportPath = Server.MapPath("~/Report.rdlc");
            ReportDataSource datasource = new ReportDataSource("Customers", dsCustomers.Tables[0]);
            ReportViewer1.LocalReport.DataSources.Clear();
            ReportViewer1.LocalReport.DataSources.Add(datasource);
        }
    }
}

VB.Net

Details

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        gvCustomers.DataSource = GetData("SELECT TOP 5 * FROM Customers ORDER BY NEWID()")
        gvCustomers.DataBind()
    End If
End Sub

Private Function GetData(query As String) As DataTable
    Dim conString As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Dim cmd As New SqlCommand(query)
    Using con As New SqlConnection(conString)
        Using sda As New SqlDataAdapter()
            cmd.Connection = con

            sda.SelectCommand = cmd
            Using dt As New DataTable()
                sda.Fill(dt)
                Return dt
            End Using
        End Using
    End Using
End Function
Protected Sub OpenWindow(ByVal sender As Object, ByVal e As EventArgs)
    Session("GridViewRow") = TryCast((TryCast(sender, Button)).NamingContainer, GridViewRow)
    Dim url As String = "Default.aspx"
    Dim s As String = "window.open('" & url & "', 'popup_window', 'width=600,height=800,left=100,top=100,resizable=yes');"
    ClientScript.RegisterStartupScript(Me.GetType(), "script", s, True)
End Sub

Default

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        If Session("GridViewRow") IsNot Nothing Then
            Dim dsCustomers As Customers = New Customers()
            Dim row As GridViewRow = TryCast(Session("GridViewRow"), GridViewRow)
            Dim customerId As String = row.Cells(1).Text
            Dim contactName As String = row.Cells(2).Text
            Dim city As String = row.Cells(3).Text
            Dim country As String = row.Cells(4).Text
            dsCustomers.Tables(0).Rows.Add(row.Cells(1).Text, row.Cells(2).Text, row.Cells(3).Text, row.Cells(4).Text)
            ReportViewer1.ProcessingMode = ProcessingMode.Local
            ReportViewer1.LocalReport.ReportPath = Server.MapPath("~/Report.rdlc")
            Dim datasource As ReportDataSource = New ReportDataSource("Customers", dsCustomers.Tables(0))
            ReportViewer1.LocalReport.DataSources.Clear()
            ReportViewer1.LocalReport.DataSources.Add(datasource)
        End If
    End If
End Sub

Screenshot