Parsing CDATA string to XCDATA

Question

I have a string in CDATA format. Eg:

string cdatastring = "<![CDATA[I am a string]]>";

I need to get the value inside the CDATA as a regular string by using inbuilt C# CDATA APIs. Something like below.

XCData cdataObject = (XCData)cdatastring;
string cdatavalue = cdataObject.value; //This should give me "I am a string"

Is there a way to do this?