Form Login merupakan salah satu Form untuk melengkapi Sebuah Program, dimana fungsi form tersebut adalah sebagai penentu layak tidak layaknya seseorang untuk memasuki halaman depan program , intinya form ini berfungsi untuk menentukan hak akses setiap pengguna dari program yang kita buat. adapun script VB.NET untuk membuat Form Login adalah seperti dibawah ini
Private Sub frmLogin_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
End
End Sub
Private Sub frmLogin_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
Private Sub LinkLabel2_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs)
End Sub
Private Sub login_button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles login_button.Click
If Len(Trim(UserName.Text)) = 0 Then
MessageBox.Show("Please enter user name", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
UserName.Focus()
Exit Sub
End If
If Len(Trim(Password.Text)) = 0 Then
MessageBox.Show("Please enter password", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
Password.Focus()
Exit Sub
End If
Try
Dim myConnection As OleDbConnection
myConnection = New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\SI_DB.accdb;Persist Security Info=False;")
Dim myCommand As OleDbCommand
myCommand = New OleDbCommand("SELECT Username,user_password FROM Users WHERE username = @username AND user_password = @UserPassword", myConnection)
Dim uName As New OleDbParameter("@username", SqlDbType.VarChar)
Dim uPassword As New OleDbParameter("@UserPassword", SqlDbType.VarChar)
uName.Value = UserName.Text
uPassword.Value = Password.Text
myCommand.Parameters.Add(uName)
myCommand.Parameters.Add(uPassword)
myCommand.Connection.Open()
Dim myReader As OleDbDataReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection)
Dim Login As Object = 0
If myReader.HasRows Then
myReader.Read()
Login = myReader(Login)
End If
If Login = Nothing Then
MsgBox("Login is Failed...Try again !", MsgBoxStyle.Critical, "Login Denied")
UserName.Clear()
Password.Clear()
UserName.Focus()
Else
ProgressBar1.Visible = True
ProgressBar1.Maximum = 5000
ProgressBar1.Minimum = 0
ProgressBar1.Value = 4
ProgressBar1.Step = 1
For i = 0 To 5000
ProgressBar1.PerformStep()
Next
FrmMain.ToolStripStatusLabel2.Text = UserName.Text
Me.Hide()
FrmMain.Show()
End If
myCommand.Dispose()
myConnection.Close()
Catch ex As Exception
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
End
End Sub
Private Sub LinkLabel1_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel1.LinkClicked
Me.Hide()
frmChangePassword.Show()
frmChangePassword.UserName.Text = ""
frmChangePassword.OldPassword.Text = ""
frmChangePassword.NewPassword.Text = ""
frmChangePassword.ConfirmPassword.Text = ""
frmChangePassword.UserName.Focus()
End Sub
Private Sub LinkLabel2_LinkClicked_1(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel2.LinkClicked
Me.Hide()
frmPasswordRecovery.Show()
End Sub
End Class
Jumat, 11 April 2014
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