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void Main()
{
string a=@"c:\test";
string b=@"c:\test\test1\test2";
string c=string.Join("\\",b.Split('\\').Except(a.Split('\\')).ToArray());
Console.WriteLine(c);
}
void Main()
{
string a=@"c:\test";
string b=@"c:\test\test1\test2";
string c=b.Replace(a,"");
Console.WriteLine(c); //\test1\test2
}
string bigger = @"1233456xxafieg";
string smaller = @"1233456";
int start = bigger.IndexOf(smaller);
string result = bigger.Substring(0, start) + bigger.Substring(start + smaller.Length);
Console.WriteLine(result);