FormView.FindControl (): object reference error

Question

I have a formview that has several text fields inside tr / td. I am trying to get text fields using the .FindControl method, but it returns null. FormView is always in edit mode (that's why I'm always in EditItemTemplate), and I'm trying to load querystring values ​​into text fields coming from the previous page, so I need this to happen on page_load. I have been doing this on gridviews all this time:

txtFirstName = (TextBox)fvGeneralInfo.FindControl("txtFirstName");

or like this:

txtFirstName = (TextBox)fvGeneralInfo.FooterRow.FindControl("txtFirstName");

or like this:

txtFirstName = (TextBox)fvGeneralInfo.Rows.FindControl("txtFirstName");

What gives?

<asp:FormView ID="fvGeneralInfo" runat="server" 
    DataSourceID="objInstructorDetails"
    OnItemCommand="fvGeneralInfo_ItemCommand"
    OnItemUpdated="fvGeneralInfo_ItemUpdated"  
    DefaultMode="Edit"
    DataKeyNames="InstructorID" >
    <EditItemTemplate>
        <table>
            <tr>
                <td colspan="2" class="Admin-SubHeading" style="padding-left:10px;">General Info:</td>
            </tr>
            <tr>
                <td class="Admin-FieldLabel">ID:</td>
                <td><asp:TextBox ID="txtInstructorId" runat="server" CssClass="Admin-Textbox" ReadOnly="true" Text='<%# Bind("InstructorID") %>' /></td>
            </tr>
            <tr>
                <td class="Admin-FieldLabel">First Name:</td>
                <td><asp:Textbox ID="txtFirstName" runat="server" CssClass="Admin-Textbox" Text='<%# Bind("FirstName") %>' /></td>
            </tr>
            </table>  
        </EditItemTemplate>
    </asp:FormView>

Answer 1

First call DataBind();. ThenFindControl()

Answer 2

abatishchev , : DataBind().

<asp:FormView ID="fvMember" runat="server" DataSourceID="tblMembers" DefaultMode="Insert" OnDataBound="DataBound">...</asp:FormView>

---

protected void DataBound(object sender, EventArgs e)
{
    if (fvMember.CurrentMode == FormViewMode.Edit)
    {
        Label lblSubmit = fvMember.FindControl("lblSubmit") as Label;
        ...
    }
}