In which data type can I store a 128-bit data in c#?
For example
dataType bit128 = 340282366920938463463374607431768211455;
What will be the datatype?
You should consider using BigInteger
The BigInteger type is an immutable type that represents an arbitrarily large integer whose value in theory has no upper or lower bounds."
string positiveString = "91389681247993671255432112000000"; string negativeString = "-90315837410896312071002088037140000"; BigInteger posBigInt = 0; BigInteger negBigInt = 0; try { posBigInt = BigInteger.Parse(positiveString); Console.WriteLine(posBigInt); } catch (FormatException) { Console.WriteLine("Unable to convert the string '{0}' to a BigInteger value.", positiveString); } if (BigInteger.TryParse(negativeString, out negBigInt)) Console.WriteLine(negBigInt); else Console.WriteLine("Unable to convert the string '{0}' to a BigInteger value.", negativeString); // The example displays the following output: // 9.1389681247993671255432112E+31 // -9.0315837410896312071002088037E+34