Checking To See If A Record Exists Before Inserting

I can't seem to get this work.  I'm using SQL2005

I want to check if a record exists before entering it.  I just can't figure out how to check it before hand.

Thanks in advance. Protected Sub BTNCreateProdIDandName_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles BTNCreateProdIDandName.Click
' Define data objects
Dim conn As SqlConnection
Dim comm As SqlCommand

' Reads the connection string from Web.config
Dim connectionString As String = ConfigurationManager.ConnectionStrings("HbAdminMaintenance").ConnectionString
' Initialize connection
conn = New SqlConnection(connectionString)

' Check to see if the record exists
If
comm = New SqlCommand("EXISTS (SELECT (BuilderID, OptionNO FROM optionlist WHERE (BuilderID = @BuilderID) AND (OptionNO = @OptionNO)", conn)

Then
'if the record is exists display this message.
LBerror.Text = "This item already exists in your Option List."
Else


'If the record does not exist, add it. FYI - This part works fine by itself.
comm = New SqlCommand("INSERT INTO [OptionList] ([BuilderID], [OptionNO], [OptionName]) VALUES (@BuilderID, @OptionNO, @OptionName)", conn)

comm.Parameters.Add("@BuilderID", System.Data.SqlDbType.Int)
comm.Parameters("@BuilderID").Value = LBBuilderID.Text

comm.Parameters.Add("@OptionNO", System.Data.SqlDbType.NVarChar)
comm.Parameters("@OptionNO").Value = DDLProdID.SelectedItem.Value

comm.Parameters.Add("@OptionName", System.Data.SqlDbType.NVarChar)
comm.Parameters("@OptionName").Value = DDLProdname.SelectedItem.Value

LBerror.Text = DDLProdname.SelectedItem.Value & " was added to your Option List."

Try
'open connection
conn.Open()
'execute
comm.ExecuteNonQuery()
Catch
'Display error message
LBerror.Text = "There was an error adding this Option. Please try again."
Finally
'close connection
conn.Close()
End Try

End If

End Sub