我收到错误“未处理的无效强制转换异常”。我正在使用 SQL Server 2008 和 Visual Studio 2008。我从字符串“Jack”转换为布尔类型无效。
请参阅下面我的表单代码:
Imports System.Boolean
Imports System.Data.SqlClient
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim username As String
Dim pswd As String
Dim conn As SqlConnection
Dim cmd As SqlCommand
Dim reader As SqlDataReader
username = txt_username.Text
pswd = txt_password.Text
txt_username.Text = Focus()
txt_password.Visible = "False"
Try
conn = New SqlConnection("data source=TAMIZHAN\SQLEXPRESS;persistsecurity info=False;initial catalog=log;User ID=sa;Password=123");
cmd = New SqlCommand("Select usename,passw from Userlog where usename='" + username + "' & passw='" + pswd + "'")
conn.Open()
reader = cmd.ExecuteReader()
If (String.Compare(pswd and '"+passw+"')) Then
MsgBox("Success")
End If
If (reader.Read()) Then
MsgBox("Login success")
End If
conn.Close()
Catch ex As Exception
MsgBox("Error"+ex.Message());
End Try
End Sub
End Class