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Copies an Stream into another Stream

using System; using System.Collections.Generic; using System.Text; using System.Collections.ObjectModel; using System.IO; namespace AntEater.Runtime.Tests.Services.Transformation {     /// <summary>     /// Provides a set of Utilities.     /// </summary>     internal class Utilities     {         /// <summary>         /// Copies an Stream into another Stream.         /// </summary>         /// <param name="from">From.</param>         /// <param name="to">To.</param>         /// <param name="buffersize">The buffersize.</param>         /// <returns>The number of Bytes copied.</returns>         public static long CopyStream(Stream from, Stream to, int buffersize) {             byte[] buffer = new byte[buffersize];             long totalBytesCopied = 0;             int bytesRead = 0;             bytesRead = from.Read(buffer, 0, buffersize);             while(bytesRead > 0){                 to.Write(buffer, 0, bytesRead);                 totalBytesCopied += bytesRead;                 bytesRead = from.Read(buffer, 0, buffersize);             }             return totalBytesCopied;         }     } }