using System.Text;

 using System.Diagnostics;

 using System.Security;

 using System.Security.Cryptography;

 protected void Page_Load(object sender, EventArgs e)

     {

         string salted = "abcdefghijklm";

         string digest = SHA256Encrypt(salted);

         byte[] b = System.Text.Encoding.Default.GetBytes(digest);

         Response.Write(Convert.ToBase64String(b));

         Response.End();

     }

     public string SHA256Encrypt(string strIN)

     {

         //string strIN = getstrIN(strIN);

         byte[] tmpByte;

         SHA256 sha256 = new SHA256Managed();

         tmpByte = sha256.ComputeHash(GetKeyByteArray(strIN));

         sha256.Clear();

         return GetStringValue(tmpByte);

     }

     private string GetStringValue(byte[] Byte)

     {

         string tmpString = "";

         ASCIIEncoding Asc = new ASCIIEncoding();

         tmpString = Asc.GetString(Byte);

         return tmpString;

     }

     private byte[] GetKeyByteArray(string strKey)

     {

         ASCIIEncoding Asc = new ASCIIEncoding();

         int tmpStrLen = strKey.Length;

         byte[] tmpByte = new byte[tmpStrLen - ];

         tmpByte = Asc.GetBytes(strKey);

         return tmpByte;

     }