Question

I have a subroutine to insert a record to sql server table.
The code:

    public void Insert_Met(int Counts, char Gender)
    {
        Dictionary<string, object> parameters = new Dictionary<string, object>();
        parameters.Add("@Counts", Counts);
        parameters.Add("@Gender", Gender);
        // run a stored procedure ExecuteNonQuery
    }

I other line code,

      int counts = Convert.ToInt32(numberUpdowncontrol1.Text);
       // from a control, maybe empty then it is null.
      Insert_Met(counts,'M');

My question is sometimes Counts can be null, so how to change my code?

Thanks,

Answer 1

You could use int? counts instead of int counts, and check the value within your method:

public void InsertMet(int? counts, char gender)
{
    Dictionary<string, object> parameters = new Dictionary<string, object>();
    parameters.Add("@Counts", counts.HasValue ? counts.Value : (object)DBNull.Value);
    parameters.Add("@Gender", gender);
    // run a stored procedure ExecuteNonQuery
}

---

it is a numericupdown control in windows form. I feel that it is hard to assign a text to an int variable. How to change it?

In order to set the count value appropriately for the above, you could do:

int value = (int)numberUpdowncontrol1.Value;
int? counts = !string.IsNullOrEmpty(numberUpdowncontrol1.Text) ? value : (int?)null;

InsertMet(counts, 'M');