Get (Retrieve) QueryString value from Url in TextBox on Button Click using C# and VB.Net in ASP.Net

Hi nauna,

Check this example. now take its reference.

HTML

<asp:TextBox runat="server" ID="txtValue" /><br />
<asp:Button Text="Get" runat="server" ID="btnGet" OnClick="OnGet" /><br />
<asp:Label Text="" runat="server" ID="lblValue" />

Code

C#

protected void OnGet(object sender, EventArgs e)
{
    string value = txtValue.Text.Trim();
    string name = value.Substring(value.IndexOf('?')).Split('=')[1];
    lblValue.Text = name;
}