Locating dropdownlist inside of asp.net gridview template field in C#

Question

So i have this gridview as shown below:

<asp:GridView ID="gridDetaljiNarudzbe" AutoGenerateColumns="false" AllowPaging="true" PageSize="10" runat="server" OnRowCommand="gridDetaljiNarudzbe_RowCommand" OnPageIndexChanging="gridDetaljiNarudzbe_PageIndexChanging" OnRowDataBound="gridDetaljiNarudzbe_RowDataBound">
    <Columns>
       <asp:BoundField DataField="Naziv" HeaderText="Naziv" />
       <asp:BoundField DataField="Sifra" HeaderText="Šifra" />
       <asp:BoundField DataField="Cijena" HeaderText="Cijena" />
       <asp:BoundField DataField="Kolicina" HeaderText="Količina" />
            <asp:TemplateField HeaderText="Ocjena">
            <ItemTemplate>
                <asp:DropDownList  ID="DropDownList1" runat="server"></asp:DropDownList>
            </ItemTemplate>
        </asp:TemplateField>
      <asp:TemplateField>
          <ItemTemplate> 
              <asp:LinkButton ID="btnOcijeni" title="Ocijeni proizvod" CommandName="OcijeniCommand" CommandArgument='<%# Eval("ProizvodID") %>' runat="server"><img src="../images/ocijeni.png" /></asp:LinkButton>
          </ItemTemplate>
      </asp:TemplateField>
    </Columns>
</asp:GridView>

I was wondering is there any way I can access this dropdown list and populate it with data. I have tried the following codes, but none of them work, all returned error "object reference not set to an intstance":

      DropDownList drop =  gridDetaljiNarudzbe.FindControl("DropDownList1") as DropDownList;

Then I would do the following: drop.Items.Add(new ListItem("test"));

I have also tried with the RowDataBound event, but it also haven't worked...

DropDownList droplist = e.Row.FindControl("DropDownList1") as DropDownList;

then populating the grid with the following code just for sake of testing if it works:

drop.Items.Add(new ListItem("test"));

But none of these worked... I would also like to know how to get a value from this dropdown and insert it into the DB when someone picks up something from it. Can someone help me out with this please?

It's more simple just use an `ObjectDataSource` and point your `DropDownList` to use it. — Vitor Canova, Nov 17 '14 at 13:09

score 2 · Accepted Answer · answered Nov 17 '14 at 11:13

2

This should do it

foreach (GridViewRow gr in gridDetaljiNarudzbe.Rows)
{
    DropDownList drop =  gr.FindControl("DropDownList1") as DropDownList;
    drop.Items.Add(new ListItem("test"));
}

or if you want to do it in RowDataBound event

protected void gridDetaljiNarudzbe_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        DropDownList drop =  e.Row.FindControl("DropDownList1") as DropDownList;
        drop.Items.Add(new ListItem("test"));
    }
}

answered Nov 17 '14 at 11:13

ekad

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Thank you it works!!! Do I repeat the same procedure when I want to pick up value from the dropdown list and insert it into the database? – perkes456 Nov 17 '14 at 11:22
Yes, you can use the first code to pick up the value from the dropdown list. – ekad Nov 17 '14 at 11:24
I'm trying now to pick up a value from a TextBox field, and when I try to get it using the same line of code it says: input text was not in correct format... Any ideas what could it be? – perkes456 Nov 17 '14 at 12:11
I believe that error is out of this question's context, but it's been asked before on SO, for example [here](http://stackoverflow.com/q/19049906/1905949) – ekad Nov 17 '14 at 12:20

Locating dropdownlist inside of asp.net gridview template field in C#

1 Answers1