vb.net 连接数据库的字符串怎么变成活的？
Using ShowDataBinding As New DataClasses1DataContext("Data Source=PC2013030515PKF;Initial Catalog=song;Integrated Security=True")
If Not ShowDataBinding.DatabaseExists() Then
MsgBox("显示数据失败，请检查数据库连通！")
Else
Dim SelData = From cust In ShowDataBinding.xm1
If SelData.Any Then
DataGridView1.DataSource = SelData
End If
End If
End Using这是一个查询的语句。我想实现连接字符串的
Using ShowDataBinding As New DataClasses1DataContext("Data Source=PC2013030515PKF;Initial Catalog=song;Integrated Security=True")这句变成通用的 在主窗体设置登陆界面，通过输入进行登陆，不知道代码应该怎没写。我是新人。多多指教一下吧。 VB.NET 数据库 --------------------编程问答-------------------- 大神们都在干嘛呢。来帮帮小弟吧。 --------------------编程问答-------------------- dim str as string="填写要连接的数据库"
dim conn as sqldataconnection(str)
conn.open()
dim sql as string ="你要填写的字符串 比如：select * from user where username= '"& "小王" &"'"
dim cmd as sqlcommand(sql,conn)
补充：VB , 数据库(包含打印，安装，报表)
