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建立一個模塊,在其中定義全局變量
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Public a as string
public b as string
然后在注冊,登陸界面分別引用就好了
創(chuàng)建完相應(yīng)的用戶名,密碼控件之后,輸入以下代碼:
Imports System.Data.OleDb
Public Class Form1
Private Sub cmdok_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdok.Click
Dim m_username As String
Dim m_userpwd As String
Dim cmd_result As MsgBoxResult
Dim m_da As New OleDbDataAdapter
Dim m_ds As New DataSet
Dim m_command As New OleDbCommand
Dim strsql As String
m_username = txtusername.Text
m_userpwd = txtuserpwd.Text
strsql = " select * from user_info where username='" m_username "' and userpwd='" m_userpwd "'"
OleDbConnection1.Open()
m_command.CommandType = CommandType.Text
m_command.CommandText = strsql
m_command.Connection = OleDbConnection1
m_da.SelectCommand = m_command
m_da.Fill(m_ds, "user_info")
If m_ds.Tables("user_info").Rows.Count 0 Then
cmd_result = MsgBox("歡迎登錄", MsgBoxStyle.OKOnly, "提示")
Else
MsgBox("登錄失敗,請確認(rèn)用戶名和密碼")
End If
End Sub
End Class
頁面打不開?難道防火墻阻攔?一般不會取消對VS2008的支持吧,要不再你卸載界面下卸載看看有沒有注冊選項,vs2008專業(yè)版在卸載的時候有注冊選項的