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Answer to Question #4862 in C# for Olivia Weizman

Question #4862
I have a homework to do in C Sharp. My teacher want us to replace a string x by a string y in a string p WITHOUT using the System.Replace thing. Please help me and know that we didnt learn lot. Help me using very basic method. Thnxxxxxx
Expert's answer
static public string ReplaceString(string str, string oldValue, string newValue, StringComparison comparison)
StringBuilder sb = new StringBuilder();

int previousIndex = 0;
int index = str.IndexOf(oldValue, comparison);
while (index != -1)
sb.Append(str.Substring(previousIndex, index - previousIndex));
index += oldValue.Length;

previousIndex = index;
index = str.IndexOf(oldValue, index,

return sb.ToString();

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