how to compare two string in the csharp web application

You can also use-
if(String.Compare(arrStr, temp) == 0) 
      Console.WriteLine("equal"); 
else 
      Console.WriteLine("are not equal");
Happy learning...

Your code works fine for me. Are you sure you are checking for same string values

You can also compare string like

string arrStr = "str";
        string temp = "str";
        if (str1==str2)
        {
            Response.Write("equal");
        }
        else
        {
            Response.Write("not");
        }