formating on date in C#

use this

String.Format("{0:M/d/yyyy}", dt);

http://www.csharp-examples.net/string-format-datetime/[^]

See this short example as a reference:

DateTime nu = DateTime.Now;
String myFormattedDate = nu.ToString("MM/dd/yyyy");

This is the MSDN page for custom string formats:http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx[^].

Regards,

Manfred

string date2;
string date1 ="1/9/2010";
string [] x1;

x1=date1.Split('/');

date2 = x1[1] + "/" + x1[0] + "/" + x1[2];

Response.Write(date2);  // 9/1/2010

Just learn all of the methods System.DataTime.ToString and standard or custom format strings (please see the MSDN articles referenced below).

Pay attention for the code sample showing how to use CultureInfo as IFormatProvider: http://msdn.microsoft.com/en-us/library/ht77y576.aspx[^].

Please see:
http://msdn.microsoft.com/en-us/library/system.datetime.aspx[^],
http://msdn.microsoft.com/en-us/library/az4se3k1.aspx[^],
http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx[^].

Pay attention that some standard formats produce different results for different cultures; and the culture used is defined by the current culture of the calling thread. To change the culture of the thread, use System.Threading.Thread.CurrentCulture, please see:
http://msdn.microsoft.com/en-us/library/system.threading.thread.currentculture.aspx[^].

—SA