Hi indradeo,

Please refer below sample.

HTML

Default

<table>
    <tr>
        <td>Number:<asp:TextBox ID="txtNumber" runat="server"></asp:TextBox></td>
    </tr>
    <tr>
        <td>Country:<asp:TextBox ID="txtCountry" runat="server"></asp:TextBox></td>
    </tr>
    <tr>
        <td>City:<asp:TextBox ID="txtCity" runat="server"></asp:TextBox></td>
    </tr>
</table>
<asp:Label ID="lblMessage" runat="server"></asp:Label>
<table>
    <tr>
        <td>
            <asp:DropDownList ID="DropDownList1" runat="server" BorderColor="Transparent" BorderStyle="None" CssClass="auto-style14" Height="28px" Width="130px">
                <asp:ListItem Value="Services">Services</asp:ListItem>
                <asp:ListItem Value="Purches">Purches</asp:ListItem>
            </asp:DropDownList>
            <asp:Label ID="lblNumber" runat="server"></asp:Label>
            <asp:Label ID="lblMessege" runat="server"></asp:Label>
        </td>
    </tr>
    <tr>
        <td><asp:Button ID="btnSend" runat="server" Text="Send" OnClick="Send" /></td>
    </tr>
</table>

Home

<asp:Label ID="lblNumber" runat="server"></asp:Label>

Code

C#

Default

protected void Send(object sender, EventArgs e)
{
    int number = int.Parse(txtNumber.Text);
    if (number > 40000000 && number <= 150000000)
    {
        lblMessage.Text = "Services";
        Session["Pkgnm"] = txtNumber.Text;
        Session["estcst"] = txtCountry.Text;
        Session["comprd"] = txtCity.Text;
        Session["Message"] = "Services";
        Response.Redirect("Home.aspx");
    }
    else if (number > 150000000)
    {
        lblMessage.Text = "Purches";
        Session["Pkgnm"] = txtNumber.Text;
        Session["estcst"] = txtCountry.Text;
        Session["comprd"] = txtCity.Text;
        Session["Message"] = "Purches";
        Response.Redirect("Home.aspx");
    }
    else
    {
        Session["Pkgnm"] = txtNumber.Text;
        Session["estcst"] = txtCountry.Text;
        Session["comprd"] = txtCity.Text;
        Session["Whether"] = DropDownList1.SelectedItem.Text;
        Response.Redirect("Default.aspx");
    }
}

Home

protected void Page_Load(object sender, EventArgs e)
{
    lblNumber.Text = Session["Message"].ToString();
}

VB.Net

Default

Protected Sub Send(ByVal sender As Object, ByVal e As EventArgs)
    Dim number As Integer = Integer.Parse(txtNumber.Text)
    If number > 40000000 AndAlso number <= 150000000 Then
        lblMessage.Text = "Services"
        Session("Pkgnm") = txtNumber.Text
        Session("estcst") = txtCountry.Text
        Session("comprd") = txtCity.Text
        Session("Message") = "Services"
        Response.Redirect("Home.aspx")
    ElseIf number > 150000000 Then
        lblMessage.Text = "Purches"
        Session("Pkgnm") = txtNumber.Text
        Session("estcst") = txtCountry.Text
        Session("comprd") = txtCity.Text
        Session("Message") = "Purches"
        Response.Redirect("Home.aspx")
    Else
        Session("Pkgnm") = txtNumber.Text
        Session("estcst") = txtCountry.Text
        Session("comprd") = txtCity.Text
        Session("Whether") = DropDownList1.SelectedItem.Text
        Response.Redirect("Default.aspx")
    End If
End Sub

Home

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    lblNumber.Text = Session("Message").ToString()
End Sub

Screenshot