vbnet登錄,vb net

vb.net 用戶登入相關(guān)問題

首先要把Label1的屬性Visible設(shè)置為false，然后雙擊button1輸入：

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Dim rs As New Data.DataView()

Dim rs As New DataView()

conn.DataFile = "users.mdb"

conn.SelectCommand = "select top 1 * from users where name='" txtUserName.Text "'and pass='" txtPassword.Text "'"

rs = conn.Select(DataSourceSelectArguments.Empty)

if rs.Count Then

Label1.Visible=true

Session("name") = Trim(txtUserName.Text)

Session("pass") = Trim( txtPassword.Text)

MsgBox("登錄成功", MsgBoxStyle.SystemModal)

Response.Redirect("")

Else

MsgBox("對不起！用戶名和密碼不正確，請重新輸入。", MsgBoxStyle.SystemModal)

End If

VB.net 如何實現(xiàn)記住密碼 自動登錄

代碼如下：

/// summary

/// 連接到窗體：通過密碼保護(hù)信息找回密碼！

/// /summary

/// param name="sender"/param

/// param name="e"/param

private void lbl_mibao_Click(object sender, EventArgs e)

{

Getbackpwd getbackpwd = new Getbackpwd();

getbackpwd.Show();

}

/// summary

/// 當(dāng)該窗體加載時從xml文件中讀取用戶信息并加載到combox的Items中

/// /summary

/// param name="sender"/param

/// param name="e"/param

private void Addresslist_Load(object sender, EventArgs e)

{

XmlTextReader reader = new XmlTextReader(@"E:\面向?qū)ο?-C#練習(xí)\通訊錄\address list\address list\user.xml");

while (reader.Read())

{

//if (reader.LocalName.Equals("Name") || reader.LocalName.Equals("Number"))

if (reader.LocalName.Equals("username"))

{

this.cmbUserName.Items.Add(reader.ReadString());

}

//if (reader.LocalName.Equals("Number"))

//{

// this.label2.Text += reader.ReadString() + "\n";\

//}

}

reader.Close();

}

/// summary

/// 保存用戶名到user.xml

/// /summary

//在listcontol上更改SelectedValue時執(zhí)行從數(shù)據(jù)庫讀取密碼的事件

private void cmbUserName_SelectedValueChanged(object sender, EventArgs e)

{

string username = cmbUserName.Text.Trim();

string sql = string.Format("select pwd from Admin where Username='{0}'", username);

try

{

SqlCommand command = new SqlCommand(sql, DBHelper.connection);

DBHelper.connection.Open();

SqlDataReader dataReader = command.ExecuteReader();

while (dataReader.Read())

{

txtpwd.Text = (string)dataReader["pwd"];

checkBoxpwd.Checked = true;

}

}

catch

{

MessageBox.Show("數(shù)據(jù)庫操作出錯！");

}

finally

{

DBHelper.connection.Close();

}

}

/// summary

/// 記住密碼操作

/// /summary

/// param name="sender"/param

/// param name="e"/param

private void checkBoxpwd_Enter(object sender, EventArgs e)

{

bool check = true;

check = checkinput(cmbUserName.Text.Trim());

if ((string)cmbUserName.Text.Trim() == "")

{

MessageBox.Show("請輸入用戶名", "輸入提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

cmbUserName.Focus();

}

else

{

if (txtpwd.Text.Trim() == "")

{

MessageBox.Show("請輸入密碼", "輸入提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

txtpwd.Focus();

}

else

{

bool isValidUser = false; // 標(biāo)識是否為合法用戶

string message = ""; // 如果登錄失敗，顯示的消息提示

// 如果驗證通過，就顯示相應(yīng)的用戶窗體，并將當(dāng)前窗體設(shè)為不可見

if (ValidateInput())

{

// 調(diào)用用戶驗證方法

isValidUser = ValidateUser(cmbUserName.Text, txtpwd.Text, ref message);

// 如果是合法用戶，顯示相應(yīng)的窗體

if (isValidUser)

{

if (check == true)

{

XmlDocument doc = new XmlDocument();

doc.Load(@"E:\面向?qū)ο?-C#練習(xí)\通訊錄\address list\address list\user.xml");//(@"E:\面向?qū)ο?-C#練習(xí)\通訊錄\address list\address list\user.xml");

XmlElement node = doc.CreateElement("user");

XmlNode xnode = (XmlNode)doc.CreateElement("username");

xnode.InnerText = cmbUserName.Text.Trim();

node.AppendChild(xnode);

doc.DocumentElement.InsertAfter(node, doc.DocumentElement.LastChild);

doc.Save(@"E:\面向?qū)ο?-C#練習(xí)\通訊錄\address list\address list\user.xml");

//doc.Load (@"E:\面向?qū)ο?-C#練習(xí)\通訊錄\address list\address list\user.xml");

}

}

// 如果登錄失敗，顯示相應(yīng)的消息

else

{

MessageBox.Show(message, "記住密碼失?。?, MessageBoxButtons.OK, MessageBoxIcon.Information);

}

}

}

}

}

/// summary

/// 驗證當(dāng)前combox中內(nèi)容是否已經(jīng)存在于xml文件中

/// /summary

/// param name="text"/param

/// returns/returns

private bool checkinput(string text)

{

int count;

bool c = true;

for (count = 0; count cmbUserName.Items.Count;count ++ )

{

if (text ==(string )cmbUserName .Items [count])

{

c=false;

}

}

return c;

}

xml文件內(nèi)容如下：?xml version="1.0" encoding="utf-8"?

person

user

VB.NET用戶登錄，賬號密碼正確，卻提示密碼錯誤！

Private?Sub?BtOk_Click(ByVal?sender?As?Object,?ByVal?e?As?System.EventArgs)?Handles?Btok.Click

Dim?con?As?OleDbConnection?=?New?OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data?Source=Admin.accdb;Persist?Security?Info=True")

Dim?com?As?OleDbCommand?=?New?OleDbCommand("select?*?from?用戶名",?con)

con.Open()

Dim?h1?As?OleDbDataReader

Dim?table?As?New?DataTable

h1?=?com.ExecuteReader()

table.Load(h1)

If?txtName.Text?=?""?Then

MsgBox("請輸入用戶名",?MsgBoxStyle.OkCancel?+?MsgBoxStyle.Exclamation,?"錯誤提示")

ElseIf?txtName.Text??""?And?txtPasswd.Text?=?""?Then

MsgBox("請輸入密碼",?MsgBoxStyle.OkCancel?+?MsgBoxStyle.Exclamation,?"錯誤提示")

ElseIf?table.Select("用戶名='"??txtName.Text??"'").Length??0?Then

If?table.Select("用戶名='"??txtName.Text??"'")(0)("密碼").ToString?=?txtPasswd.Text?Then

MsgBox("成功登陸",?MsgBoxStyle.OkCancel?+?MsgBoxStyle.Exclamation,?"錯誤提示")?Then

Form1.Show()

Me.Visible?=?False

Exit?Sub

Else

MsgBox("密碼錯誤",?MsgBoxStyle.OkCancel?+?MsgBoxStyle.Exclamation,?"錯誤提示")

End?If

Else

MsgBox("用戶名不存在",?MsgBoxStyle.OkCancel?+?MsgBoxStyle.Exclamation,?"錯誤提示")

Exit?Sub

End?If

table.Clear()

h1.Close()

con.Close()

End?Sub

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