Checking the element and attributes values already exists in Xml file using C#

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C#

XML

C#4.0

Hello,

Can any one guide me with a idea.

iam creating a XML file from C#.
I have a window with some textboxes and Button to create xml file.

i enter some data in textboxes and click on button which creates xml file.
if the file alredy exists iam appending data to the existing file.

here if the enter the same data i dont want to append the data to the xml. in my case it is appending the same data also.

so plz give me idea how can i check if the element and attribute values which i enter already exits in the xml file. if exists i dont want to add the data otherwise add the data to the xml file.

thanks,