vb.net - C# string replace from position X to Y only -

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possible duplicate:
how perform string replacement on subsection of string?

how replace string position x y only, there string method?

input = abcdxyzabcdxyz

string replace input (start position = 3, end position=9, xyz pqr)

xyz position 3 9 should replaced

output = abcdpqrabcdxyz

here extension method create method described:

public static class stringextension {     public static string replace(this string basevalue, int start, int length, string oldvalue, string newvalue)     {         return basevalue.substring(0, start) + basevalue.substring(start, length).replace(oldvalue, newvalue) + basevalue.substring(start + length, basevalue.length - (start + length));     } }

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