how to hit URL through httpwebrequest .

Please use this
Response.Redirect("http://10.10.113.73:8080/PaymentGateway/merchantTranVerification.jsp")

Just so you are aware, that you are using a local networking IP thus probably restricting you from accessing that file you are trying to ' hit ' it remotely. What do you mean by hit? Since i am not clear on what you want, I've provided you a C# example of StreamReader to read the file from a WebRequest. Let me know if this is what you want or not. Either way, it answers your question in the examples.

C#

private void Main_Load(object sender, EventArgs e)
{
    WebRequest request = WebRequest.Create("http://10.10.113.73:8080/PaymentGateway/merchantTranVerification.jsp");
    request.Credentials = CredentialCache.DefaultCredentials;
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
    Stream iDataStream = response.GetResponseStream();
    StreamReader reader = new StreamReader(iDataStream);
    string eresponse = reader.ReadToEnd();
    MessageBox.Show(eresponse);
    reader.Close();
    iDataStream.Close();
    response.Close();
}

.Net

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Dim inStream As StreamReader
    Dim webRequest As WebRequest
    Dim webresponse As WebResponse
    webRequest = webRequest.Create("http://10.10.113.73:8080/PaymentGateway/merchantTranVerification.jsp")
    webresponse = webRequest.GetResponse()
    inStream = New StreamReader(webresponse.GetResponseStream())
    Dim AvailCode As String = inStream.ReadToEnd()
    MsgBox("AvailCode: " + AvailCode)
End Sub

Just creating a HttpWebRequest won't really do anything. You'll have to call GetResponse before something will happen:

HttpWebResponse response = (HttpWebResponse)request.GetResponse();

As soon as GetResponse is called the server will be contacted.

Cheers!

-MRB