无法将参数值从DropDownList转换为字符串

Question

I here trying to make dropdownlist value insert into my sqldatabase but it does not work. Can you help me find what I did wrong?

This some my asp.net code for dropdownlist:

<p> Hardware Type&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; :
    <asp:DropDownList ID="DropDownList1" runat="server" Height="17px" Width="128px">
        <asp:ListItem>Please Choose</asp:ListItem>
        <asp:ListItem Value="laptop">Laptop</asp:ListItem>
        <asp:ListItem Value="server">Server</asp:ListItem>
        <asp:ListItem Value="television">Television</asp:ListItem>
        <asp:ListItem Value="printer">Printer</asp:ListItem>
    </asp:DropDownList>

this some my .cs for dropdownlist

comu.Parameters.Add("Hwtype", SqlDbType.VarChar, 50);
comu.Parameters["Hwtype"].Value = DropDownList1;
comu.Connection = con;
comu.ExecuteNonQuery();
con.Close();
}
}

i get this error : Failed to convert parameter value from a DropDownList to a String.

Answer 1

Problem : You are trying to assign the DropDownList control instead of it's SelectedValue .

Replace This:

comu.Parameters["Hwtype"].Value = DropDownList1;

With This:

comu.Parameters["Hwtype"].Value = DropDownList1.SelectedValue;

OR

comu.Parameters["Hwtype"].Value = DropDownList1.Items[DropDownList1.SelectedIndex];