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LINQ, alias name, vb.net

Posted on 2014-12-01
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Last Modified: 2016-02-15
The following code populates cmbSelectCustomer with CustomerID and works fine. I want display CustName by incorporating something like this with the LINQ:

Let CustName = c.FirstName & " " & c.LastName

And also have in code:

cmbSelectCustomer.DisplayMember = "CustName"
cmbSelectCustomer.ValueMember = "CustomerID"
 


Question: How can I revise this code to do above items?
       
 ' LOAD THE DATA TABLE
        Dim Cs = From c In db.tblCustomers _
                 Order By c.CustomerID _
                 Select c.CustomerID

        cmbSelectCustomer.Items.Clear()

        For Each cust In Cs
            cmbSelectCustomer.Items.Add(cust.ToString)
        Next

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Comment
Question by:Mike Eghtebas
  • 5
  • 2
7 Comments
 
LVL 64

Accepted Solution

by:
Fernando Soto earned 2000 total points
ID: 40473973
Hi eghtebas;

You can modify your code like the following to get what you need.

Dim Cs = (From c In db.tblCustomers _
          Order By c.CustomerID _
          Select CustName = c.FirstName & " " & c.LastName, c.CustomerID).ToArray()

cmbSelectCustomer.DataSource = Nothing
cmbSelectCustomer.DataSource = Cs

'' If DisplayMember and ValueMember are incorrect just reverse them.
cmbSelectCustomer.DisplayMember = "CustomerID"
cmbSelectCustomer.ValueMember = "CustName"

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0
 
LVL 34

Author Comment

by:Mike Eghtebas
ID: 40474020
Hi Fernando,

Only the following code is able to display some data as shown on the attache d image:
       Dim Cs = From c In db.tblCustomers _
         Order By c.CustomerID _
         Select c.CustomerID, CustName = c.FirstName & " " & c.LastName

        ' cmbSelectCustomer.DataSource = Nothing
        ' cmbSelectCustomer.DataSource = Cs

        For Each cust In Cs
            cmbSelectCustomer.Items.Add(cust.ToString)
        Next

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cmbBox1.png
0
 
LVL 34

Author Comment

by:Mike Eghtebas
ID: 40474058
Maybe this is step in right direction but still no solution with for each or datasource options:
 Dim Cs As List(Of tblCustomer) = From c In db.tblCustomers _
         Order By c.CustomerID _
         Select c.CustomerID, CustName = c.FirstName & " " & c.LastName

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LVL 64

Expert Comment

by:Fernando Soto
ID: 40474144
You have not implemented the query as I have posted it, use the ToArrat method on it. Also don't use  the For Each loop to fill the combo box use the DataSource method  and then use the DisplayMember and ValueMember.
0
 
LVL 34

Author Comment

by:Mike Eghtebas
ID: 40474155
Wow, I totally goofed on that.

On another question I am preparing to post is I want to add Union Select 0, "- all -" as first record. I never done union with LINQ before.

Mike
0
 
LVL 34

Author Comment

by:Mike Eghtebas
ID: 40474160
0
 
LVL 34

Author Comment

by:Mike Eghtebas
ID: 40474501
If you intend to work on the new question, you may find this link below helpful:
http://stackoverflow.com/questions/4751924/linq-union-how-to-add-a-literal-value-to-the-query
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