Using conn As New SqlConnection("connString")
Using cmd As SqlCommand = New SqlComand("SELECT ColumnName FROM TableName", conn)
Using reader As SqlDataReader = cmd.ExecuteReader()
dim DR as SQLDataReader
dim cmd as SQLCommand
cmd = New SqlCommand("SELECT Column FROM table", DBconnection)
DR = cmd.ExecuteReader()
If DR.HasRows Then
Do While DR.Read()
Sure it does, you must have the correct connection string of your database. Are you sure you have one?
Which is exactly your database?
To answer on your last question, myComboBox is a reference (a reference name) to your ComboBox control.
When you create (instanitate) new comboBox control you do:
ComboBox comboBox1 = new ComboBox(); //is this example comboBox1 is same as myComboBox - its just a variable - name
But this code does C# automatically by it self when you add this control to the form. If you will look into Desiger of your form, you will see this code is there. And much more (like Size, Location, Index,...)