主题：用户登录时密码错误

Dim UserName As String = e.Form.Controls("用户名").Value
Dim cmd As New SQLCommand
Dim dt As DataTable
Dim dr As DataRow
cmd.C
If UserName = ""  Then
    Messagebox.show("请选择用户!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
    Return
End If
cmd.CommandText = "Select * From {User} Where [Name] = '" & UserName & "'"
dt = cmd.ExecuteReader
If dt.DataRows.Count = 0 Then
    Messagebox.show("此用户不存在!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
    Return
End If
dr = dt.DataRows(0)

If  e.Form.Controls("密码").Value = dr("Password") Then
    _UserName = UserName
    _UserGroup = dr("Groupname")
    e.Form.Close
Else
    Messagebox.show("密码错误!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
End If


输入用户名和密码，登录时，怎么总是提示密码错误