How to create a ComboBox autofill using SQLite Data Reader - vb.net

Question

I have two Combo-Boxes like this
I need to create an auto-fill feature for the 1st Combo-Box. It should list the EmployeeID if Search-By Field is specified as Employee-Number. Similarly it should list Employee First Name along with Last Name if the Search-By Field is Employee-Name.
How can I do this? I have no clue, I am doing this for the first time. I am using SQLite, Visual Studio 2010.
Dim mySelectQuery As String = "SELECT " & Search & " FROM EmployeeTable WHERE Status LIKE '" & Status & "'"
Dim myConnString As String = "Data Source=" & Application.StartupPath & "\Database\SimpleDB.db3"
Dim sqConnection As New SQLiteConnection(myConnString)
Dim sqCommand As New SQLiteCommand(mySelectQuery, sqConnection)
sqConnection.Open()
Try
' Always call Read before accessing data.
Dim sqReader As SQLiteDataReader = sqCommand.ExecuteReader()
Dim j As Integer = sqReader.FieldCount
While sqReader.Read()
'''''''''''''''''''''''Here, Don't know how to list the items from the query reult into the combo-box
End While
'Close Reader after use
sqReader.Close()
Catch ex As Exception
'Show Message on Error
MsgBox(ex.ToString)
Finally
'At Last Close the Connection
sqConnection.Close()
End Try

Answer 1

I'm not sure entirely what you are asking but I think this is it.
In the SelectedIndex changed event you would have something similar to the code below. You can add an If statement to check what you are querying for and adjust your query accordingly.
Dim dt as New DataTable
Try
Using sqlConn
sqlConn.Open()
Using cmd As New SqlCommand("your query")
cmd.Connection = sqlConn
cmd.CommandType = CommandType.Text
Dim reader as SqlDataReader = cmd.ExecuteReader()
dt.Load(reader)
End Using
End Using
Catch ex As SqlException
Throw New Exception(ex.Message)
End Try
With yourComboBox
.DataSource = dt
.DataValueField = "columName you want to be the value of the item"
.DataTextField = "columnName of the text you want displayed"
End With

Answer 2

Notice the following properties for the combo-box: AutoCompleteMode, AutoCompleteSource, AutoCompleteCustomSource.
Select the appropriate AutoCompleteMode. See details on the different modes at this link.
For AutoCompleteSource, choose either ListItems (in which case the source will be the items of the ComboBox) or CustomSource. Should you choose CustomSource, set the appropriate source as the value of the ComboBox's AutoCompleteCustomSource property.
This should provide you with enough details to do what you're looking for.
The other requirements you've listed - such as taking the data from an SQLite database or changing between employee name and employee number - won't affect the way you work with the AutoComplete feature.