Save and retrieve QueryString value from ASP.Net HiddenField using C# and VB.Net

Hi ramco1917,

Please refer below sample.

HTML

Default

<asp:LinkButton Text="Send" runat="server" PostBackUrl="~/Home.aspx?Value=Atom" />

Home

<asp:HiddenField ID="hfType" runat="server" />
<asp:Button Text="Save" runat="server" OnClick="OnSave" />

Code

Home

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!string.IsNullOrEmpty(Request.QueryString["Value"]))
    {
        hfType.Value = Request.QueryString["Value"];
    }
}

protected void OnSave(object sender, EventArgs e)
{
    string type = hfType.Value;
    ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('" + type + "');", true);
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) handles Me.Load
    If Not String.IsNullOrEmpty(Request.QueryString("Value")) Then
        hfType.Value = Request.QueryString("Value")
    End If
End Sub
Protected Sub OnSave(ByVal sender As Object, ByVal e As EventArgs)
    Dim type As String = hfType.Value
    ClientScript.RegisterStartupScript(Me.GetType(), "alert", "alert('" & type & "');", True)
End Sub

Screenshot