Question

I am doing a c# project and I have the following scenario:

I am working with visual studio and I have a winform which contains two combobox as shown in the screenshot.

The first is of months, the second is of years and a button by the side. I also have a table which contains two columns named date d(atatype small datetime) and price (varchar).

When the button is clicked I want that according to the month and year it checks the table and display the total sum of the column of price in a label.

Is that possible to do? I am not using any datagrid or anything dataview such type. I am using a label to display can I calculate and show the sum?

Answer 1

If you’re using an ADO.NET Entity Data Model then you could use this approach. Just tie the GetValues() method to either your button click event or a combo-box selection changed event.

//Get the data from your combo boxes. 
public void GetValues()
{
    string month = monthComboBox.SelectedValue.ToString(); 
    string year = yearComboBox.SelectedValue.ToString(); 
    InsertValuesInDatabase(month, year); 
}


//Insert the values into your table
public void InsertValuesInDatabase(string month, string year)
{

    try
    {
        using (var db = new MyEntities())
        {
            var newDateValueRecord = new DateValue() 
                            {
                               Month = month, 
                               Year = year
                            }

            db.DateValues.Add(newDateValueRecord); 
            db.SaveChanges(); 
        }
    }
    catch(Exception e)
    {
        Console.WriteLine(e); 
    }

}