Switch case and generics checking

Question

I want to write a function that format int and decimal differently into string

I have this code:

and I want to rewrite it to generi

Answer 1

Edit: If you only want to handle exactly int and double, just have two overloads:

DoFormat(int value)
{
}

DoFormat(double value)
{
}

---

If you insist on using generics:

switch (value.GetType().Name)
{
    case "Int32":
        break;
    case "Double":
        break;
    default:
        break;
}

OR

if (value is int)
{
    int iValue = (int)(object)value;
}
else if (value is double)
{
    double dValue = (double)(object)value;
}
else
{
}