Question

I’m trying to use LinqToSql in Visual Studio 2010(Asp.net, C#).
The insert/delete/update records works just fine but if I write letters in a int field, the program breaks in a non-pretty way.

In my DataClasses.Designer I have:

partial void Insertproduct(product instance);

and I add other class with:

public partial class product
{

    partial void OnPriceChanging(string value)
    {
        Regex Price = new Regex("^[A-Z0-9 a-z]*$");
        if (Precio.IsMatch(value) == false)
        {
            throw new Exception("Just numbers");
        }
    }

}

I don’t know what I’m missing.

Answer 1

Use int.TryParse it will return a 0 if the string cannot be converted to an int.

int number;
bool IsNumber = int.TryParse("someString", out number);