一直在关注此站点上的一个问题，尝试更改标签背景色在 .mdb 数据库中可见，使用 SQL 将 VB.Net 与数据库连接。我有一个座位计划设置为表格中的网格，使用座位标签。如果座位代码显示在预订数据库中，则标签应变为红色（预订座位时添加记录）否则，如果它没有返回任何记录，则标签保持绿色。
Private Sub CheckFriday()
Dim Friday(11, 20) As Control
'Friday Row A
Friday(1, 1) = FA1
Friday(1, 2) = FA2
Friday(1, 3) = FA3
Friday(1, 4) = FA4
Friday(1, 5) = FA5
Friday(1, 6) = FA6
Friday(1, 7) = FA7
Friday(1, 8) = FA8
Friday(1, 9) = FA9
Friday(1, 10) = FA10
Friday(1, 11) = FA11
Friday(1, 12) = FA12
Friday(1, 13) = FA13
Friday(1, 14) = FA14
'Friday Row B
Friday(2, 1) = FB1
Friday(2, 2) = FB2
Friday(2, 3) = FB3
Friday(2, 4) = FB4
Friday(2, 5) = FB5
Friday(2, 6) = FB6
Friday(2, 7) = FB7
Friday(2, 8) = FB8
Friday(2, 9) = FB9
Friday(2, 10) = FB10
Friday(2, 11) = FB11
Friday(2, 12) = FB12
Friday(2, 13) = FB13
Friday(2, 14) = FB14
Friday(2, 15) = FB15
Friday(2, 16) = FB16
'Friday Row C
Friday(3, 1) = FC1
Friday(3, 2) = FC2
Friday(3, 3) = FC3
Friday(3, 4) = FC4
Friday(3, 5) = FC5
Friday(3, 6) = FC6
Friday(3, 7) = FC7
Friday(3, 8) = FC8
Friday(3, 9) = FC9
Friday(3, 10) = FC10
Friday(3, 11) = FC11
Friday(3, 12) = FC12
Friday(3, 13) = FC13
Friday(3, 14) = FC14
Friday(3, 15) = FC15
Friday(3, 16) = FC16
Friday(3, 17) = FC17
'Friday Row D
Friday(4, 1) = FD1
Friday(4, 2) = FD2
Friday(4, 3) = FD3
Friday(4, 4) = FD4
Friday(4, 5) = FD5
Friday(4, 6) = FD6
Friday(4, 7) = FD7
Friday(4, 8) = FD8
Friday(4, 9) = FD9
Friday(4, 10) = FD10
Friday(4, 11) = FD11
Friday(4, 12) = FD12
Friday(4, 13) = FD13
Friday(4, 14) = FD14
Friday(4, 15) = FD15
Friday(4, 16) = FD16
Friday(4, 17) = FD17
Friday(4, 18) = FD18
Friday(4, 19) = FD19
'Friday Row E
Friday(5, 1) = FE1
Friday(5, 2) = FE2
Friday(5, 3) = FE3
Friday(5, 4) = FE4
Friday(5, 5) = FE5
Friday(5, 6) = FE6
Friday(5, 7) = FE7
Friday(5, 8) = FE8
Friday(5, 9) = FE9
Friday(5, 10) = FE10
Friday(5, 11) = FE11
Friday(5, 12) = FE12
Friday(5, 13) = FE13
Friday(5, 14) = FE14
Friday(5, 15) = FE15
Friday(5, 16) = FE16
Friday(5, 17) = FE17
Friday(5, 18) = FE18
Friday(5, 19) = FE19
Friday(5, 20) = FE20
'Friday Row F
Friday(6, 1) = FF1
Friday(6, 2) = FF2
Friday(6, 3) = FF3
Friday(6, 4) = FF4
Friday(6, 5) = FF5
Friday(6, 6) = FF6
Friday(6, 7) = FF7
Friday(6, 8) = FF8
Friday(6, 9) = FF9
Friday(6, 10) = FF10
Friday(6, 11) = FF11
Friday(6, 12) = FF12
Friday(6, 13) = FF13
Friday(6, 14) = FF14
Friday(6, 15) = FF15
Friday(6, 16) = FF16
Friday(6, 17) = FF17
Friday(6, 18) = FF18
Friday(6, 19) = FF19
Friday(6, 20) = FF20
'Friday Row G
Friday(7, 1) = FG1
Friday(7, 2) = FG2
Friday(7, 3) = FG3
Friday(7, 4) = FG4
Friday(7, 5) = FG5
Friday(7, 6) = FG6
Friday(7, 7) = FG7
Friday(7, 8) = FG8
Friday(7, 9) = FG9
Friday(7, 10) = FG10
Friday(7, 11) = FG11
Friday(7, 12) = FG12
Friday(7, 13) = FG13
Friday(7, 14) = FG14
Friday(7, 15) = FG15
Friday(7, 16) = FG16
Friday(7, 17) = FG17
Friday(7, 18) = FG18
Friday(7, 19) = FG19
'Friday Row H
Friday(8, 1) = FH1
Friday(8, 2) = FH2
Friday(8, 3) = FH3
Friday(8, 4) = FH4
Friday(8, 5) = FH5
Friday(8, 6) = FH6
Friday(8, 7) = FH7
Friday(8, 8) = FH8
Friday(8, 9) = FH9
Friday(8, 10) = FH10
Friday(8, 11) = FH11
Friday(8, 12) = FH12
Friday(8, 13) = FH13
Friday(8, 14) = FH14
Friday(8, 15) = FH15
Friday(8, 16) = FH16
Friday(8, 17) = FH17
Friday(8, 18) = FH18
Friday(8, 19) = FH19
'Friday Row J
Friday(9, 1) = FJ1
Friday(9, 2) = FJ2
Friday(9, 3) = FJ3
Friday(9, 4) = FJ4
Friday(9, 5) = FJ5
Friday(9, 6) = FJ6
Friday(9, 7) = FJ7
Friday(9, 8) = FJ8
Friday(9, 9) = FJ9
Friday(9, 10) = FJ10
Friday(9, 11) = FJ11
Friday(9, 12) = FJ12
Friday(9, 13) = FJ13
Friday(9, 14) = FJ14
Friday(9, 15) = FJ15
Friday(9, 16) = FJ16
Friday(9, 17) = FJ17
Friday(9, 18) = FJ18
Friday(9, 19) = FJ19
'Friday Row K
Friday(10, 1) = FK1
Friday(10, 2) = FK2
Friday(10, 3) = FK3
Friday(10, 4) = FK4
Friday(10, 5) = FK5
Friday(10, 6) = FK6
Friday(10, 7) = FK7
Friday(10, 8) = FK8
Friday(10, 9) = FK9
Friday(10, 10) = FK10
Friday(10, 11) = FK11
Friday(10, 12) = FK12
Friday(10, 13) = FK13
Friday(10, 14) = FK14
Friday(10, 15) = FK15
Friday(10, 16) = FK16
Friday(10, 17) = FK17
Friday(10, 18) = FK18
Friday(10, 19) = FK19
'Friday Row L
Friday(11, 1) = FL1
Friday(11, 2) = FL2
Friday(11, 3) = FL3
Friday(11, 4) = FL4
Friday(11, 5) = FL5
Friday(11, 6) = FL6
Friday(11, 7) = FL7
Friday(11, 8) = FL8
Friday(11, 9) = FL9
Friday(11, 10) = FL10
Friday(11, 11) = FL11
Friday(11, 12) = FL12
Friday(11, 13) = FL13
Friday(11, 14) = FL14
Friday(11, 15) = FL15
Dim A As Integer = 0
Dim x As Integer
Dim y As Integer
con.ConnectionString = dbProvider & dbSource
con.Open() 'opens the connection to the database
For y = 1 To 11
For x = 1 To 20
SQL = "SELECT * FROM Sales where SEAT_ID = '" & Friday(x, y) & "'"
da = New OleDb.OleDbDataAdapter(Sql, con) 'create a data adapter to store the filtered data using the SQL code
MsgBox(Sql)
da.Fill(ds, A)
A = A + 1
Dim recordCount As Integer
recordCount = ds.Tables(A).Rows.Count
MsgBox(recordCount)
If recordCount = 1 Then
Friday(x, y).BackColor = Color.Red
Else
Friday(x, y).BackColor = Color.Green
End If
Next x
Next y
End Sub
我收到此错误：
错误 1 运算符 '&' 没有为类型 'String' 和 'System.Windows.Forms.Control' 定义。C:\Users\Connor Loughlin\Desktop\WindowsApplication1\WindowsApplication1\SeatingPlan.vb 238 23 SADS 预订系统
非常感谢您的建议或反馈，VB 肯定不是我最擅长的主题。
谢谢您的帮助！