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我在.CommandText中的SAVE和UPDATE按钮中收到错误

"Error: Operator '&' is not defined for types 'String' and 'System.Windows.Forms.TextBox'."

我不知道SAVE和UPDATE按钮中的错误是什么.

这是我的代码:

Private Sub BtnSave_Click(sender As Object, e As EventArgs) Handles BtnSave.Click
    Try
        With cm
            .Connection = cn
            .CommandText = "insert into [edit$]values('" & TxtId.Text & "','" & TxtFamilyname.Text & "','" & TxtGivenname.Text & "','" & TxtGender.Text & "','" & TxtDob.Text & "','" & TxtExamdate.Text & "','" & TxtExamtime.Text & "','" & TxtStreet.Text & "','" & TxtHouse.Text & "','" & TxtPlz.Text & "','" …