LinqToSql query : deal with null values - sql-server

Question

Here's a Linq-to-SQL query to check in a SQL Server view if 2 values are present: an integer (LOT) and a string (ART_CODE).
But sometimes those values are null in the view. In that case I get an exception showing up on screen.
How can I modify this code to deal with null values?
private void ValidProdPlusLotBtn_Click(object sender, RoutedEventArgs e)
{
int lot = Convert.ToInt32(NumLotTxtBox.Text);
string artCode = ArtCodeLB.Content.ToString();
try
{
#region Qte Restant à produire
DataClasses1DataContext dc2 = new DataClasses1DataContext();
var reste = from r in dc.Vw_MajPoids_Restant
where r.LOT == lot && r.ART_CODE == artCode
select new
{
r.PnetRestant,
r.NbuRestant
};
LotRestantTB.Text = reste.First().PnetRestant.ToString();
NbuRestantTB.Text = reste.First().NbuRestant.ToString();
#endregion
}
catch (Exception ex)
{
StackTrace st = new StackTrace();
Messages.ErrorMessages($"{st.GetFrame(1).GetMethod().Name}\n\n{ex.ToString()}");
}
}

Answer 1

I've found this which is working perfectly :
private void ValidProdPlusLotBtn_Click(object sender, RoutedEventArgs e)
{
int lot = Convert.ToInt32(NumLotTxtBox.Text);
string artCode = ArtCodeLB.Content.ToString();
try
{
#region Qte Restant à produire
DataClasses1DataContext dc2 = new DataClasses1DataContext();
var reste = from r in dc.Vw_MajPoids_Restant
where r.LOT == lot && r.ART_CODE == artCode
select new
{
r.PnetRestant,
r.NbuRestant
};
if(!reste.Any())
{
// Do nothing
}
else
{
LotRestantTB.Text = reste.First().PnetRestant.ToString();
NbuRestantTB.Text = reste.First().NbuRestant.ToString();
}
#endregion
}
catch (Exception ex)
{
StackTrace st = new StackTrace();
Messages.ErrorMessages($"{st.GetFrame(1).GetMethod().Name}\n\n{ex.ToString()}");
}
}
If it can help someone else...