parsing string to int c#

var myInt = int.Parse("123"); // this one throw exception if the argument is not a number
var successfullyParsed = int.TryParse("123", out convertedInt); //this returns true if the convertion has been successfully done (integer is stored in "convertedInt"), otherwise false. 

int i = 0;

// bool to Int32
bool b = true;
i = Convert.ToInt32(b);

// byte to Int32
byte bt = 3;
i = Convert.ToInt32(bt);

// char to Int32
char c = 'A';
i = Convert.ToInt32(c);

// DateTime to Int32
DateTime dt = DateTime.Now;
i = Convert.ToInt32(dt);

// Decimal to Int32
decimal d = 25.678m;
i = Convert.ToInt32(d);

// double to Int32
double db = 0.007234;
i = Convert.ToInt32(db);

string userInput = Console.ReadLine();
int convert;
Int32.TryParse(userInput, out convert);  // Converting String to int

    string str = "10s";
 
    int x = Convert.ToInt32(str);
	Console.WriteLine(x);