Skip row in gridview asp.net-CodePudding

I have a gridview showing academy name and a dropdown list. The dropdown list have value of 0-13, 0 is the "Please select option". I want when the save button it skip those row where there is no selection in the dropdown therefore 0.

Here is my code for the gridview:

    <asp:GridView ID="gdvAcadSelec" runat="server" AutoGenerateColumns="False"
        DataKeyNames="acad_Id"
        DataSourceID="srcAcademy"
          OnRowDataBound="gdvAcadSelec_RowDataBound"
        CssClass="table table-striped table-bordered"
        EnableViewState="False">
        <Columns>
             <asp:BoundField DataField="acad_Id" HeaderText="Id"  />
            <asp:BoundField DataField="acad_name" HeaderText="Academy"  />
 

             <asp:TemplateField HeaderText="Choice">
                        <ItemTemplate>
                            <asp:DropDownList ID="ddlPref" OnTextChanged="ddlPref_TextChanged" AutoPostBack="true" runat="server">
                              
                            </asp:DropDownList>
                        </ItemTemplate>
                    </asp:TemplateField>
        </Columns>
    </asp:GridView>
    <asp:Button ID="btnsubmit" CssClass="btn btn-info" OnClick="btnsubmit_Click" runat="server" Text="Submit" />

    <asp:ObjectDataSource ID="srcAcademy"
        TypeName="dataAccessLayer"
        SelectMethod="getAcademy"
        runat="server" />

The code behind for the binding of item for the column Choice:

      protected void gdvAcadSelec_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            //Find the DropDownList in the Row
            DropDownList ddlCountries = (e.Row.FindControl("ddlPref") as DropDownList);
            ddlCountries.Items.Insert(0, new ListItem("Please select"));
            ddlCountries.Items.Insert(1, new ListItem("1"));
            ddlCountries.Items.Insert(2, new ListItem("2"));
            ddlCountries.Items.Insert(3, new ListItem("3"));
            ddlCountries.Items.Insert(4, new ListItem("4"));
            ddlCountries.Items.Insert(5, new ListItem("5"));
            ddlCountries.Items.Insert(6, new ListItem("6"));
            ddlCountries.Items.Insert(7, new ListItem("7"));
            ddlCountries.Items.Insert(8, new ListItem("8"));
            ddlCountries.Items.Insert(9, new ListItem("9"));
            ddlCountries.Items.Insert(10, new ListItem("10"));
            ddlCountries.Items.Insert(11, new ListItem("11"));
            ddlCountries.Items.Insert(12, new ListItem("12"));
            ddlCountries.Items.Insert(13, new ListItem("13"));
        }

On click save button:

 protected void btnsubmit_Click(object sender, EventArgs e)
        {

        foreach (GridViewRow row in gdvAcadSelec.Rows)
        {
            DropDownList ddlorder = (DropDownList)row.FindControl("ddlPref");

           
            string acadID = row.Cells[0].Text;

            string order = ddlorder.SelectedValue.ToString();

                SqlCommand scmd = new SqlCommand();
                scmd.CommandType = CommandType.Text;
                scmd.CommandText = "Insert into tblAcademy_Selection (acad_Id,stud_Id,order_preference) values (@acad,@stud,@order)";
                scmd.Connection = con;
                scmd.Parameters.AddWithValue("@acad", acadID);
                scmd.Parameters.AddWithValue("@stud", 60);
                scmd.Parameters.AddWithValue("@order", order);
                con.Open();
                scmd.ExecuteNonQuery();
                con.Close();
            
        }
}

The problem with this code is when it is saving to the database ,those dropdowns list who have value "please select" is also being save and this crash my website. What can I do to skip those dropdown that do not have value selected? Thank you in advance.

CodePudding user response：

(Edited per request from OP) Simply use an if() statement to skip the values you don't want to insert.

string order = ddlorder.SelectedIndex.ToString();
if (order != "0") { // Some may argue that it should be !order.equals("0") but in C# it doesn't matter.
    SqlCommand scmd = new SqlCommand();
    scmd.CommandType = CommandType.Text;
.
.
}

And if you're a prudent (and paranoid) programmer, you won't trust anything sent from the browser, you'll check to make sure the variable order is the appropriate type and is within the range of values you expect as well.