How to find substring from string without using indexof method in C#?

Question

I want to find the position of a substring in a string if present without using any string method including indexof. I tried so much times but failed. Will anybody tell me h

Answer 1

Try this:

internal bool SearchWord(string str, string searchKey)
{
    int j = 0; bool result = false;
    for (int i = 0; i < str.Length; i++)
    {
        if (searchKey[j] == str[i])
        {
            j++; //count++;
        }
        else { j = 0; }

        if (j == searchKey.Length)
        {
            result = true;
            break;
        }
    }
    return result;
}