C# how can I check exception?

You could use exceptions, but exceptions are expensive for the code to generate and shouldn't really be used as validation, especially when there is a likelihood the conversion will fail, such as when validating input from the user.

Instead you should use string.split (google for examples) to split the string on the comma, then go through each segment and use the appropriate TryParse function, so int.TryParse, bool.TryParse etc to validate them in turn. Again just google for examples of how to use int.tryParse etc.

For int you must try TryParse method.

For string u can typecast like :

int intA = 10;
string a = (string) intA;

but sometimes this may throw exceptions.

Instead try using : 

int intA = 10;
string a = Convert.ToString(intA);

The Convert.ToString() method will never throw exception and handles null as well when compared to typecasting.

string a = intA.Tostring();