asp.net 开发用vb语言编写“查找”功能代码

DropDownList控件+DataGrid控件+SQL Server 实现查找并显示信息。
根据DropDownList选择的内容搜索数据库中的字段用DataGrid输出信息，
需要完整的代码。

答案：    SqlConnection conn = new SqlConnection("Server=WWW-2270B8786BB;Integrated Security=SSPI;Database=Northwind;Uid=sa;Pwd=sa;");
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string sqlStr = "select * from Orders ";
            SqlCommand cmd = new SqlCommand(sqlStr, conn);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);
            this.DropDownList1.DataSource = ds.Tables[0].DefaultView;
            DropDownList1.DataTextField = "CustomerID";
            DropDownList1.DataValueField = "OrderID";
            DropDownList1.DataBind();
        }
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        string val = DropDownList1.SelectedValue;
        string sqlStr = "select * from Orders where  OrderID= '" + val + "'";
        SqlCommand cmd = new SqlCommand(sqlStr, conn);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds);
        this.DataGrid1.DataSource = ds.Tables[0].DefaultView;
        DataGrid1.DataBind();
    }

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