vb.net做了一个注册窗口，运行通过，但总是添加失败
Private Sub addBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles addBtn.Click If txtuser.Text.Trim = "" Then MessageBox.Show("用户名不能为空") ElseIf txtpassword.Text = "" Then MessageBox.Show("密码不能为空") Exit Sub End If If o.AddUser(txtuser.Text.Trim(), txtpassword.Text。trim（）) Then MessageBox.Show("添加成功!") Me.Close() Else MessageBox.Show("添加失败!") End If End Sub Public Function AddUser(ByVal id As String, ByVal password As String, ByVal name As String) As Boolean Dim dt As DataTable = o.GetDataTable("SELECT * FROM zhanghao WHERE id='" & id & "'") Dim SQL As String SQL = "INSERT INTO zhanghao(id,password,z_name) values('" & id & "','" & password & "','" & name & "')" Return o.ExecuteSQL(SQL) End Function