Convert string to 2 decimal place

var probablyDecimalString = "0.4351242134";
decimal value;
if (Decimal.TryParse(probablyDecimalString , out value))
    Console.WriteLine ( value.ToString("0.##") );
else
    Console.WriteLine ("not a Decimal");

Well I would do:

var d = "0.4351242134";
Console.WriteLine(decimal.Parse(d).ToString("N2"));

var d = decimal.Parse("0.4351242134");
Console.WriteLine(decimal.Round(d, 2));