How to convert Guid to string and String to Guid..?

As well as the Guid constructor accepting GUID strings in various formats, you an also convert them back to a string in various formats as well by passing an argument to the ToString() method.

For details, check these links:

http://msdn.microsoft.com/en-us/library/96ff78dc.aspx

http://msdn.microsoft.com/en-us/library/97af8hh4.aspx

from GUID to String  :
string s ;
Guid g = Guid.NewGuid();

s= g.ToString();

//////

from string to guid :

g= new Guid(s);

but the string must be in the same format as Guid (00000000-0000-0000-0000-000000000000)