printing all text file from folder using c#

string myFolder = Server.MapPath("MyFolderName");
string[] filePaths = System.IO.Directory.GetFiles(myFolder);
System.Text.StringBuilder allFileText = new System.Text.StringBuilder();
System.IO.StreamReader streamReader = null;
        
   foreach (string filePath in filePaths)
   {
            if (System.IO.File.Exists(filePath))
            {
                streamReader = new System.IO.StreamReader(filePath);
                allFileText.Append(streamReader.ReadToEnd());
            }
            streamReader.Close();
            streamReader.Dispose();
   }