Does any one knows a method to get JavaScript Variable value to a C# variable VIA C# Class?Thanks a Lot!!!

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C#

ASP.NET

Javascript

Does any one knows a method to get JavaScript Variable value to a C# variable?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;           
{
   string serverName;
   string javascript = 
             "<script language=JavaScript>\n" +
             "var server = prompt('Enter SQL server Ip or Name?', 'Testserver');\n" +
             "if (favorite) alert('Successfully configured: ' +  favorite);\n" +
             "else alert('You pressed Cancel or no value was entered!');\n" +
             "</script>";
   //string h = serverName;
   System.Web.HttpContext.Current.Response.Write(javascript);

I want to get this " server" variable value to a C# variable!(String serverName)

Thanks in advance!!!