报错，如下图，求助？

谢谢各位大咖

 预览时，如在dropdownbox试输入“a”，即出现以下报错，

此主题相关图片如下：无法在 system.single 和 system.string 上执行

代码如下：

模糊查询客户-dropdownbox之TextChanged事件代码设置为：

Dim drp As WinForm.DropDownBox = e.sender
If drp.DroppedDown Then \'如果下拉窗口已经打开
    Dim tbl As Table = Tables("下拉列表_Table1")
    If drp.Text = "" Then \'如果内容为空
        tbl.Filter = "" \'显示所有客户
    Else \'否则根据输入内容进行模糊筛选
        Dim txt As String = "\'%" & drp.Text & "%\'"
        tbl.Filter = "客户 Like " & txt & " Or Company Like " & txt & " Or 主营业务 Like " & txt & _
        " Or 全称 Like " & txt & " Or fullCompany Like " & txt & " Or 客户类型 Like " & txt & _
        " Or 销售策略 Like " & txt & " Or 客户信用 Like " & txt & " Or 交货条件 Like " & txt & _
        " Or 付款条件 Like " & txt & " Or 付款方式 Like " & txt & " Or 联系人 Like " & txt & _
        " Or Name Like " & txt & " Or 联系固话1 Like " & txt & " Or 联系固话2 Like " & txt & _
        " Or 联系固话3 Like " & txt & " Or 联系手机1 Like " & txt & " Or 联系手机2 Like " & txt & _
        " Or 联系手机3 Like " & txt & " Or 联系人职务 Like " & txt & " Or Fax1 Like " & txt & _
        " Or 联系Email1 Like " & txt & " Or 联系Email2 Like " & txt & " Or 在线联系1 Like " & txt & _
        " Or 公司负责人 Like " & txt & " Or 负责人职务 Like " & txt & " Or Manager Like " & txt & _
        " Or ManagerPost Like " & txt & " Or 负责人固话1 Like " & txt & " Or 负责人固话2 Like " & txt & _
        " Or 负责人手机1 Like " & txt & " Or 负责人手机2 Like " & txt & " Or 负责人eMail1 Like " & txt & _
        " Or 负责人eMail2 Like " & txt & " Or 公司总机1 Like " & txt & " Or 办公地址 Like " & txt & _
        " Or OfficeAddress Like " & txt & " Or 公司地址 Like " & txt & " Or CompanyAddress Like " & txt & _
        " Or 法人代表 Like " & txt & " Or 结算账户名1 Like " & txt & " Or 开户币种1 Like " & txt & _
        " Or 开户机构1 Like " & txt & " Or 开户机构地址1 Like " & txt & " Or 结算账户名2 Like " & txt & _
        " Or 开户币种2 Like " & txt & " Or 开户机构2 Like " & txt & " Or 开户机构地址2 Like " & txt & _
        " Or 结算帐户名3 Like " & txt & " Or 开户币种3 Like " & txt & " Or 开户机构3 Like " & txt & _
        " Or 开户机构地址3 Like " & txt & " Or 状态 Like " & txt & " Or 建档时间 Like " & txt & _
        " Or 建档人 Like " & txt & " Or 修订时间 Like " & txt & " Or 修订摘要 Like " & txt & _
        " Or 修订人 Like " & txt & " Or 业务员 Like " & txt & " Or 结算账号3 Like " & txt & _
        " Or 结算账号2 Like " & txt & " Or 结算账号1 Like " & txt & " Or 会员 Like " & txt & _
        " Or 在线联系2 Like " & txt & " Or Fax2 Like " & txt & " Or VendorNum Like " & txt & _
        " Or VendorAddr Like " & txt & " Or Clerk Like " & txt & " Or 内销外销 Like " & txt
       
    End If
End If

多谢有点蓝，问题找到并解决了。

原来，字段“客户信用”是Single类型，我把它从filter中删除，问题就解决了。

如果不是字符类型的like查询，就这样写

"Convert(客户信用, \'System.String\') like " & txt