int number1=Convert.ToInt32(textBox1.Text); int number2=Convert.ToInt32(textBox2.Text); int sum = number1 + number2; if number1=null or "string" and number2 = null or "string" sum=0+0;
int val; int i = int.TryParse(testBox1.Text, out val) ? val : 0;
int number1 = (int.TryParse(textBox1.Text, out number1)) ? number1 : 0; int number2 = (int.TryParse(textBox2.Text, out number2)) ? number2 : 0; int sum = number1 + number2;
int a = 0; int b = 0; int.TryParse(textbox1.Text, out a); int.TryParse(textbox2.Text, out b); int sum = a + b;
class Program { static int ParseInt(string valueToParse) { int result; return int.TryParse(valueToParse, out result) ? result : result; } static void Main(string[] args) { int sum = ParseInt("H5") + ParseInt("5"); } }
var
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