Populate dynamic control value in the formview

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C#

ASP.NET

I have a webpage which has been developed using entity framework model and it contains form view and dynamic controls which have been populated automatically.
My question is,
I would like to populate <asp:DynamicControl> value from existing DynamicControls from the same form while inserting value. For example, like onblur event.

</<asp:Panel ID="pnlAppForm"  runat="server" Visible="false">
        <asp:FormView ID="ApplicationFormView" runat="server" 
        DataSourceID="App1DataSource" DataKeyNames="ApplicationID" 
        DefaultMode="Insert" oniteminserted="ApplicationFormView_ItemInserted" 
    oniteminserting="ApplicationFormView_ItemInserting">
        <EditItemTemplate>

        </EditItemTemplate>
        <InsertItemTemplate>
        
        <h2>Sample Application</h2>

        <table class="appTable">
        <tr>
            <td>First Value</td>
            <td><asp:DynamicControl ID="FirstValueDynamicControl" runat="server" DataField="Length" 
                Mode="Insert" ValidationGroup="Insert" /></td>
        </tr>

        <tr>
            <td>Second Value</td>
            <td> <asp:DynamicControl ID="SecondValueDynamicControl" runat="server" 
                DataField="Breath" Mode="Insert" ValidationGroup="Insert" /></td>
        </tr>
	<tr>
            <td>Third Value</td>
            <td> <asp:DynamicControl ID="ThirdValueDynamicControl" runat="server" 
                DataField="Total" Mode="Insert" ValidationGroup="Insert" /></td>
        </tr>
	</table>
<asp:Button ID="InsertButton" runat="server" CausesValidation="true" 
                CommandName="Insert" Text="Submit" CssClass="submitbutton" ValidationGroup="Insert" TabIndex="27" />
        </InsertItemTemplate>
        <ItemTemplate>

        </ItemTemplate>
    </asp:FormView>
 </asp:Panel><pre lang="text">

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