How do i...execute this piece of code in C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.SqlServer.Server;
using System.Data.SqlTypes;
using System.Net;
using System.IO;

namespace FCMSQL
{
    public class BaseFunctionClass
    {

         public BaseFunctionClass()
        { 
                   
        }
        

        #region "Welcome Function"
        /// <summary>
        /// This function will be called from the SQL Stored Procedure.
        /// </summary>
        /// <param name=""strName"">Name</param>
        /// <returns>Welcome Message</returns>
        [SqlProcedure]
        public static void GetMessage(SqlString strName, out SqlString strMessge)
        {

            string serverKey = "AAAAYMU8LNo:APA91bHkuINssRFTKcW8Cc1r9i3ZsERgLtS8DQqnnZzXkLZ3Xwj2nL9LujhlecCyzl5a4vc_K7859DqLTv8Q0bUqfCYi4M7yifZPUgaE9ck4cLt2N73oWbfNr4G1psffc828rIYzVa4U";

          
                var result = "-1";
                var webAddr = "https://fcm.googleapis.com/fcm/send";

                var regID = "dOw3Z_v6Gsg:APA91bGdmf_mkCmQsKWQH0vNCpfifawOeXOzKBqMxcFxhy4A88bo56qKE_-vGbTE_lAkcrWU1_5svhR3l6q6PqU0Sr6agJq0SVhmMxHe9MPPEpahGxHVeNdjX_xhma3VqQVZ6o2HqEAN";

                var httpWebRequest = (HttpWebRequest)WebRequest.Create(webAddr);
                httpWebRequest.ContentType = "application/json";
                httpWebRequest.Headers.Add("Authorization:key=" + serverKey);
                httpWebRequest.Method = "POST";

                using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
                {
                    string json = "{\"to\": \"" + regID + "\",\"notification\": {\"title\": \"New deal\",\"body\": \"welcome \"},\"priority\":10}";
                    //registration_ids, array of strings -  to, single recipient
                    streamWriter.Write(json);
                    streamWriter.Flush();
                }

                var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
                {
                    result = streamReader.ReadToEnd();
                }



          strMessge = "Welcome," + strName + ", " + "your code is gettingexecuted under CLR !";
        }

        #endregion



    }
}