大家帮我看看问题到底出在哪里？
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<html>
<script language="VB" runat="server">
Sub Page_Load(Source As Object, E As EventArgs)
Dim strConnString As String = "Data Source=ALICK;Initial Catalog=NewBridge;User Id=sa;Password=;"
Dim ds As DataSet
Dim MyConnection As SqlConnection
Dim MyCommand As SqlDataAdapter
Dim DropDownList3 As DropDownListMyConnection = New SqlConnection("Data Source=ALICK;Initial Catalog=NewBridge;User Id=sa;Password=;")
MyCommand = New SqlDataAdapter("select * from NB_user", MyConnection)
ds = new DataSet()
MyCommand.Fill(ds,"NB_user")
DropDownList3.DataSource = ds.Tables("NB_user").DefaultView
DropDownList3.DataTextField="user_truename"
DropDownList3.DataValueField="user_truename"
DropDownList3.DataBind()
End Sub
</script><BODY>
<form runat="server">
<asp:DropDownList id="DropDownList3" runat="server" /> </form></body>
</html>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<html>
<script language="VB" runat="server">
Sub Page_Load(Source As Object, E As EventArgs)
Dim strConnString As String = "Data Source=ALICK;Initial Catalog=NewBridge;User Id=sa;Password=;"
Dim ds As DataSet
Dim MyConnection As SqlConnection
Dim MyCommand As SqlDataAdapter
Dim DropDownList3 As DropDownListMyConnection = New SqlConnection("Data Source=ALICK;Initial Catalog=NewBridge;User Id=sa;Password=;")
MyCommand = New SqlDataAdapter("select * from NB_user", MyConnection)
ds = new DataSet()
MyCommand.Fill(ds,"NB_user")
DropDownList3.DataSource = ds.Tables("NB_user").DefaultView
DropDownList3.DataTextField="user_truename"
DropDownList3.DataValueField="user_truename"
DropDownList3.DataBind()
End Sub
</script><BODY>
<form runat="server">
<asp:DropDownList id="DropDownList3" runat="server" /> </form></body>
</html>
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。源错误:
行 31： MyCommand.Fill(ds,"NB_user")
行 32：
行 33： DropDownList3.DataSource = ds.Tables("NB_user").DefaultView
行 34： DropDownList3.DataTextField="user_truename"
行 35： DropDownList3.DataValueField="user_truename"
源文件: E:\s2\xq\mail_send.aspx 行: 33
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<html>
<script language="VB" runat="server">
Sub Page_Load(Source As Object, E As EventArgs)
Dim conn as New SqlConnection("Server=Localhost;uid=sa;pwd=;DataBase=database;")
Dim ds as new DataSet()
Dim comm as New SqlDataAdapter("select * from NB_user",conn)
comm.Fill(ds,"dsName")
DropDownList3.DataSource = ds.Tables("dsName").DefaultView
DropDownList3.DataTextField="user_truename"'必须保证此处的user_truename是数据库表中的字段名
DropDownList3.DataValueField="user_truename"
DropDownList3.DataBind()
End Sub
</script><BODY>
<form runat="server">
<asp:DropDownList id="DropDownList3" runat="server" />
</form>
</body>
</html>
ConnectString里面的Initial Catalog=NewBridge;是什么意思？等价于DataBase么？Data Source等价于Server么?这个实在看不懂....
还有，我一般绑定DropDownList用DataReader就好了，很少用DataSet，所以不清楚这个有问题没有
最好不要像在asp中一样了。
如果我刚才写的代码由问题
发消息给我。
--------
把Connection的Open()打开。