无法隐式转换类型＆＃39; int＆＃39;到＆＃39; System.Data.DataTable＆＃39;？8

Question

我必须更新＆＃34; cad_assign＆＃34;从下拉列表中根据所选状态单击“提交”按钮时的列。单击提交按钮时，值1应插入cad_assign列。

代码：

 protected void Button1_Click(object sender, EventArgs e)
    {
        SiteDetailsDataSetTableAdapters.tbl_SiteDetailsTableAdapter cd;
        cd = new SSiteDetailsDataSetTableAdapters.tbl_SiteDetailsTableAdapter();
        DataTable dt = new DataTable();
        dt = cd.GetUpdateCadAssign(ddlState.SelectedValue); // error shown here
    }

查询1：

UPDATE tbl_site_details SET cad_assign = 1 WHERE (state1 = @state1)

ASPX：

<asp:DropDownList ID="ddlState" runat="server" Width="150px" AutoPostBack="True" OnSelectedIndexChanged="ddlStatee_SelectedIndexChanged"> </asp:DropDownList>
<asp:Button ID="Button1" runat="server" Text="Assisgn" OnClick="Button1_Click" />

Answer 1

下面给出的代码完美无缺。谢谢大家。

protected void Button1_Click(object sender, EventArgs e)
    {
        SiteDetailsDataSetTableAdapters.tbl_SiteDetailsTableAdapter cd;
        cd = new SSiteDetailsDataSetTableAdapters.tbl_SiteDetailsTableAdapter();
        cd.GetUpdateCadAssign(ddlState.SelectedValue);
    }