Does MS C# Implementation of String check ReferenceEquals of the immuteable base String first? -

suppose had strings.

string = "this string"; strinb b = "this string"; string c = a; 

as understand string a , b not nescessarily share same immuteable base string. string c copy of a, points internally same immuteable string.

if compare a , b equality, return true. @ least because represent same character sequence.

if compare a , c equality, return true. did check characters or did compare pointers immuteable string first?

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edit:

to answer how check equality:

    private void stackoverflowequals()     {         string = @"http://stackoverflow.com/questions/25932695/does-ms-c-sharp-implementation-of-string-check-referenceequals-of-the-immuteable";         string b = @"http://stackoverflow.com/questions/25932695/does-ms-c-sharp-implementation-of-string-check-referenceequals-of-the-immuteable";         string c = a;          if (!(a == b)) throw new exception();         if (!(a == c)) throw new exception();     } 

yes, does. here's source code equals:

[reliabilitycontract(consistency.willnotcorruptstate, cer.mayfail)]         public override bool equals(object obj) {             if (this == null)                        //this necessary guard against reverse-pinvokes ,                 throw new nullreferenceexception();  //other callers not use callvirt instruction              string str = obj string;             if (str == null)                 return false;              if (object.referenceequals(this, obj))                 return true;              if (this.length != str.length)                 return false;              return equalshelper(this, str);         } 

for complete string class source code see this.