If name.Text = "" Or pass1.Text = "" Or pass2.Text = "" Or email.Text = "" Then
            Label6.Text = "你输入的信息不正确，请重新输入！"
            name.Text = ""
            pass1.Text = ""
            pass2.Text = ""
            email.Text = ""
        Else
            If pass1.Text <> pass2.Text Then
                Label6.Text = "你两次输入的密码不同，请重新输入！"
                pass1.Text = ""
                pass2.Text = ""
                email.Text = ""
            Else
                Dim conn As New SqlConnection
                Dim cmd As New SqlCommand
                Dim str As String
                Dim dr As SqlDataReader
                conn.ConnectionString = "Data Source=A71DF09BA0DB486;Initial Catalog=bbs;Integrated Security=True"
                conn.Open()
                str = "select * from member where 昵称'" & name.Text & "'"
                cmd = New SqlCommand(str, conn)
                dr = cmd.ExecuteReader()     '出现错误。
                If dr.Read() Then
                    Label6.Text = name.Text + "已经存在，请你选择另外的昵称！"
                    conn.Close()
                    Exit Sub
                End If
                dr.Close()
                conn.Close()
                str = "insert into member values('" & name.Text & "','" & pass1.Text & "','" & email.Text & "')"
                cmd = New SqlCommand(str, conn)
                conn.Open()
                cmd.ExecuteNonQuery()
                conn.Close()
                Label6.Text = "你已经注册成功"
            End If
        End If