我快被折腾死了,很简单的问题,就是调不通,救命啊!(在线等待)
Imports System.Data.SqlClient
Public Class Form1
Inherits System.Windows.Forms.Form
Private da As SqlDataAdapter
Private ds As New DataSet()
Friend WithEvents DataGrid1 As System.Windows.Forms.DataGrid
Private cnn As New SqlConnection()
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
cnn.ConnectionString = "server=rcnufsoft;user id=sa;password=;database=working"
cnn.Open()
da = New SqlDataAdapter("select * from working.dbo.salesman", cnn)
da.Fill(ds, "salesman")
DataGrid1.DataSource = ds.Tables(0)
End Sub
倒数第二行报错:未处理的“System.NullReferenceException”类型的异常出现在 test.exe 中
其他信息:未将对象引用设置到对象的实例