Question

Possible Duplicate:
How do you perform string replacement on just a subsection of a string?

How to replace a string from position X to Y only, is there a string method?

input = ABCDXYZABCDXYZ

string replace input (start position = 3, end position=9, XYZ to PQR)

XYZ from position 3 to 9 should be replaced

output = ABCDPQRABCDXYZ

Answer 1

Here is an extension method that will create the method you 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));
    }
}