关于VB.NET应用程序访问数据库时出现的问题 麻烦大侠解惑

[very_happy]

应用程序是：
Imports System.Data
Imports System.Data.SqlClient

Public Class Form1
Inherits System.Windows.Forms.Form
Dim connStr As String
Dim selectCmd As String

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
connStr = "Server=localhost;database=spj;uid=sa;pwd=;"
selectCmd = "SELECT * FROM spj"
Dim conn As SqlConnection
Dim myAdapter As SqlDataAdapter
Dim mydataset As New DataSet()
conn = New SqlConnection(connStr)
conn.Open()
myAdapter = New SqlDataAdapter(selectCmd, conn)
myAdapter.Fill(mydataset, "J")
DataGrid1.DataSource = mydataset.Tables("J")
conn.Close()
End Sub
End Class


spj是数据库 J 是数据库中的数据表


错误是：
未处理的“System.Data.SqlClient.SqlException”类型的异常出现在 System.Data.dll 中。

其他信息: 用户 'sa' 登录失败。
这是什么原因？

[快溜]

connStr = "Server=localhost;database=spj;uid=sa;pwd=;"
selectCmd = "SELECT * FROM spj"

你的连接字符串对吗？密码为空？
selectcmd字符串里spj是数据库名还是表名，跟你说的不符