code to add two no in c# with robust way

protected void btnSave_Click(object sender, EventArgs e)

	{

		int cases = ParseString(Convert.ToString(txtFirst.Text));

		int second = ParseString(Convert.ToString(txtSecond.Text));

		cases = second == cases ? cases : 0;

		string finalValue = AddValues(Convert.ToString(txtFirst.Text), Convert.ToString(txtSecond.Text),cases);

	}



	private int ParseString(string str)

	{

		Int32 intValue;

		Int64 bigintValue;

		decimal doubleValue;

		char charValue;



		// Place checks higher in if-else statement to give higher priority to type.



		if (Int32.TryParse(str, out intValue))

			return 1;

		else if (Int64.TryParse(str, out bigintValue))

			return 2;

		else if (decimal.TryParse(str, out doubleValue))

			return 3;

		else if (Char.TryParse(str, out charValue))

			return 5;

		else return 0;



	}





	private string AddValues(string first, string second, int Cases)

	{

		string values = string.Empty;

		switch (Cases)

		{

			case 1:// for int 

				values = (Convert.ToInt16(first) + Convert.ToInt16(second)).ToString();

			break;

			case 2:// for long 

				values = (Convert.ToInt64(first) + Convert.ToInt64(second)).ToString();

			break;

			case 3://for float

				values = (Convert.ToDouble(first) + Convert.ToDouble(second)).ToString();

			break;

			case 4:// for char

				values = (Convert.ToChar(first) + Convert.ToChar(second)).ToString();

			break;

			default:

				values = first + second;

			break;

		}



		return values;

	}

Regards,
Singaravel M

Life is a Race
Thanks & Regards
By
Sabari Mahesh P M