Position of a string

try this below code

string str1;
string findstr;
Console.Write("\n\nSearch the position of a substing within a string :\n");
Console.Write("-------------------------------------------------------\n");
Console.Write("Input a String: ");
str1 = Console.ReadLine();
Console.Write("Input a substring to be found in the string: ");
findstr = Console.ReadLine();
int index = str1.IndexOf(findstr);
if(index<0)
Console.WriteLine("The substring no found in the given string \n"); else
Console.WriteLine("Found '{0}' in '{1}' at position {2}", findstr, str1, index);