public static void Main()
var templateURL = @"https://online.steppestravel.com/dhruvonlinepayment/onlinepayment.aspx?refno={0}&user={1}&hash={2}&success={3}&cenable={4}";
var finalURL = string.Format(templateURL , 1 , "darshan" , @"djdjureujdjj#" , true , true);
Console.WriteLine(finalURL);