Managing Blank field from Linq Query - sql

Question

I am writing a method in VB.Net that runs a LINQ query on my database, and puts the information from the query into textboxes on a form.
Public Sub OpenPartWindow(ByVal partNumber As String)
Using dbContext As New DB_LINQDataContext
Dim query = (From p In dbContext.Parts
Join ppl In dbContext.Part_Price_Logs On p.Part_ID Equals ppl.Part_ID
Where p.Part_Number = partNumber
Select p.Part_Number, p.Part_Description, p.Part_Information, p.Supplier.Supplier_Name, _
p.Part_Manufacturer.Manufacturer_Name, p.Part_Subcategory.Part_Category.Category_Description, _
p.Part_Subcategory.Subcategory_Description, ppl.Cost_Per_Unit, ppl.Discount_Percentage).First()
MessageBox.Show(query.ToString())
txtPartNum.Text = query.Part_Number.ToString()
txtSupplier.Text = query.Supplier_Name.ToString()
txtManufacturer.Text = query.Manufacturer_Name.ToString()
txtPrice.Text = query.Cost_Per_Unit.ToString()
txtDiscount.Text = query.Discount_Percentage.ToString()
txtDescription.Text = query.Part_Description.ToString()
txtInfo.Text = query.Part_Information.ToString()
Me.Show()
End Using
End Sub
The issue I am having right now is with the last field, the txtInfo TextBox. You see the Part_Information field on the database allows NULL values. So when I go to fill the field when the field is null I am getting a NullReferenceException, which is understandable. However I cannot find a way to get around this exception.
I've tried:
If Not IsNothing(query._Part_Information.ToString()) Then
As well as
If query.Part_Information.Length > 0 Then
As If statements to run through first. But I keep getting the error each time. So I am confused on how I am suppose to deal with this error.

Answer 1

You can use either of the following options:
txtInfo.Text = String.Format("{0}", query.Part_Information)
txtInfo.Text = $"{query.Part_Information}" → $ - String Interpolation
txtInfo.Text = query.Part_Information?.ToString() → ?. - Null Conditional Operator
If query.Part_Information is null, the first two expressions result in Sting.Empty and the last one result in Nothing.