On Button click outlook will open and the link generated will be copied to outlook

You can try use the onclientclick event.

<asp:Button ID="btnRedirect" CssClass="form-submit-button" 
                  Text=" Copy to Outlook" runat="server" onclientclick="email(this.form.txtLink.value);return false;" />

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then try add this into your HTML:

<script>
    function email(URL) {
        document.location.href = "mailto:test@example.com?subject=subject&body=" + URL;
    }
</script>

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Javascript popups are sometimes disabled on different machines/browsers which will prevent the javascript code from executing. You can try this server side in C# as well.

using System.Diagnostics;

 protected void btnRedirect_Click(object sender, EventArgs e)
        {

            var myUrl = "mailto:someone@somewhere.com?subject=Test&body=" + txtLink.Text;
            Process.Start(myUrl);


            Response.Redirect(URL + "?" + getQueryString());
        }

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Hi sana,

First add reference of ‘Microsoft.Office.Interop.Outlook’ library in your project. This code will run on any machines that contains Outlook locally.

Then add below lines of code to your .cs page.

protected void btnRedirect_Click(object sender, EventArgs e)
        {
            //Response.Redirect(URL + "?" + getQueryString());
            string Messagebody = URL + "?" + getQueryString();
            CreateMailItem(Messagebody);
        }

        private void CreateMailItem(string Messagebody)
        {
            Microsoft.Office.Interop.Outlook.Application oApp = new Microsoft.Office.Interop.Outlook.Application();
            Microsoft.Office.Interop.Outlook.MailItem mailItem = (Microsoft.Office.Interop.Outlook.MailItem)oApp.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olMailItem);
            mailItem.Subject = "This is the test message";
            mailItem.To = "contactus@authorcode.com";
            mailItem.CC = "supporttools@authorcode.com";
            mailItem.Body = Messagebody;
            mailItem.Importance = Microsoft.Office.Interop.Outlook.OlImportance.olImportanceNormal;
            mailItem.Display(false);
            mailItem = null;
            oApp = null;
        }

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For more details please follow the link.

http://www.authorcode.com/how-to-create-outlook-email-item-using-c-and-vb-net/

Actually i am working on server so how would i add reference of ‘Microsoft.Office.Interop.Outlook’ library in my project, because it is not showing