C#

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System.IO.FileStream file=System.IO.File.OpenWrite(_fileName);//file to be written<br />
System.IO.MemoryStream ms=new System.IO.MemoryStream();//in memory stream for some puspose<br />
dataset.WriteXml(ms);//write dataset into memory stream<br />
ms.Position=0;<br />
byte[] buffer=new byte[ms.Length];//create buffer<br />
ms.Position=0;<br />
ms.Read(buffer,0,buffer.Length);//read memory stream<br />
ms.Close();<br />
file.Position=0;<br />
file.SetLength(0);	//flush the main file<br />
buffer=System.Text.Encoding.UTF8.GetBytes(Encrypter.EncryptData(System.Text.Encoding.UTF8.GetString(buffer)));//encrypt data<br />
file.Write(buffer,0,buffer.Length);//write dato into main file<br />
file.Close();//close file<br />

string today = "Saturday" ;
string temp  = string.Format ( "Today is {0}" , today ) ;