Binding DropDownList inside DetailsView

Question

I am having trouble trying to populate a drop down list from a database. When I try to set the data source, I cannot find the drop-down control, it is in DetailsView, so I think that it can have something to do with it only when it is created in edit mode. He still talks about it in the current mode when I edit, so I don’t know what is going on there.

Here is the code from the aspx file:

<asp:DetailsView id="DetailsView1" runat="server" AutoGenerateRows="false" DataSourceID="myMySqlDataSrc"  DataKeyNames="id" AutoGenerateDeleteButton="True" AutoGenerateEditButton="True" AutoGenerateInsertButton="False" >
     <Fields>
        <asp:TemplateField HeaderText="Region">
            <ItemTemplate><%# Eval("region_name") %></ItemTemplate>
            <EditItemTemplate>
                <asp:DropDownList ID="RegionDropdownList" runat="server" SelectedValue='<%# Bind("region_id")%>' />
            </EditItemTemplate>
        </asp:TemplateField>        
     </Fields>
</asp:DetailsView>

And this is from the code behind:

ArrayList regionsList = BPBusiness.getRegions();
if (DetailsView1.CurrentMode == DetailsViewMode.Edit)
{
    DropDownList ddlRegions = (DropDownList)DetailsView1.FindControl("RegionDropdownList");
    if (ddlRegions != null)
    {
        ddlRegions.DataSource = regionsList;
        ddlRegions.DataBind();
    }
}

Answer 1

, DetailsView1_ModeChanged DetailsView1_DataBound. DetailsView1_ModeChanging, .

EDIT: , DataTextField DataValueField :

DropDownList1.DataTextField = "TextFieldName";
DropDownList1.DataValueField = "ValueFieldName";

SelectedValue; , .

2: , , - :

if(DropDownList1.Items.Contains(DropDownList1.Items.FindByValue("Value")))
{
    DropDownList1.SelectedIndex = DropDownList1.Items.IndexOf(DropDownList1.Items.FindByValue("Value));
}

Answer 2

itemcreated

protected void DetailsView1_ItemCreated(object sender, EventArgs e)
{
    ArrayList regionsList = BPBusiness.getRegions();
    if (DetailsView1.CurrentMode == DetailsViewMode.Edit)
    {
        DropDownList ddlRegions = (DropDownList)DetailsView1.FindControl("RegionDropdownList");
        if (ddlRegions != null)
        {
            ddlRegions.DataSource = regionsList;
            ddlRegions.DataBind();
        }
    }
}

OnItemCreated="DetailsView1_ItemCreated"