how to use multiple combo boxes to filter data - vb.net

Question

can someone please help me with this problem i'm a beginner in programming.
there is two comboboxes which is S.Y.(school year) and Sem(semester) and i want to use these two combo boxes to have more specific data in the listview below.
Private Sub Search_Record()
Dim conn As New OleDbConnection
Dim cmd As New OleDbCommand
Dim da As New OleDbDataAdapter
Dim dt As New DataTable
Dim sSQL As String = String.Empty
Try
conn = New OleDbConnection(Get_Constring)
conn.Open()
cmd.Connection = conn
cmd.CommandType = CommandType.Text
sSQL = "SELECT edp_number, LastName + ', ' + FirstName as name, course as course, Address as address, syear as syear, Sem as sem FROM tblStudent"
If Me.cboSearchBy.Text = "1st" Then
sSQL = sSQL & " where Sem like '1st" & Me.txtSearch.Text & "%'"
Else
sSQL = sSQL & " where Sem like '2nd" & Me.txtSearch.Text & "%'"
End If
cmd.CommandText = sSQL
da.SelectCommand = cmd
da.Fill(dt)
Me.dtgResult.DataSource = dt
If dt.Rows.Count = 0 Then
MsgBox("No record found!")
End If
Catch ex As Exception
MsgBox(ErrorToString)
Finally
conn.Close()
End Try
End Sub
this code only uses the sem combobox which is cboSearchby so now all i need to know is how to make combobox S.Y to function too and if also to use that texbox to search for firstname and lastname.

Answer 1

you just have to add another condition in your If statement:
If Me.cboSearchBy.Text = "1st" and Me.cboSY.Text = "2014-2015" Then
sSQL = sSQL & " where Sem like '1st" & Me.txtSearch.Text & "%' and SY like '" & Me.cboSY.Text & "%' "
Else
sSQL = sSQL & " where Sem like '2nd" & Me.txtSearch.Text & "%' and SY like '" & Me.cboSY.Text & "%' "
End If
then if you want to add the searching for lastname and firstname, just add another condition on the IF-Statement.
Take Note: In using Logical Operator, AND is true if all condition is true while OR is true if atleast one of the conditions is true.