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Inserting windows form data into SQL Server 2008 table in vb.net

Posted on 2014-02-19
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Last Modified: 2014-02-20
Hi all.

I have the code below that inserts data into a SQL table using Visual Studio 2010. It works perfectly but I had a question concerning the & and + in the Insert Into part of the code.

In my code I used the &, but I've seen online some people use + and I tested my code with + and it also worked fine.

Does it matter which one I use, what is the best practice? Thank you in advance.

Dim con As New SqlConnection
        Dim cmd As New SqlCommand

        con.ConnectionString = "Data Source=myserver;Initial Catalog=mydb;Integrated Security=True"

        con.Open()

        cmd.Connection = con

        cmd.CommandText = "INSERT INTO ItemQuote(MasterItemNumber) VALUES ('" & txtMasterItemNo.Text & "')"
        cmd.ExecuteNonQuery()

        MsgBox("Item has been submitted")

        con.Close()

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Question by:printmedia
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Craig Wagner earned 2000 total points
ID: 39871198
This has nothing to do with inserting data into SQL Server. Your question is about concatenating strings in VB.Net.

& and + are both concatenation operators. The problem comes in if you try to mix data types.

Dim s, t As String
Dim i As Integer

s1 = "Hello"
i = 1

t = s1 + i

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The last line will throw an exception because i is an integer so it assumes the + means addition and will try to cast s to an integer, which it can't do.

Generally you should use & for string concatenation in VB.NET to avoid ambiguity.
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