Avoid duplicate data when using asp:control to insert - asp.net

Question

I have a ASP.NET code, I use it to insert and view my data from a *.mdb file.
When I reload the browser reload, it insert the same old data.
<asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False"
DataKeyNames="user_id" DataSourceID="AccessDataSource1" Height="50px"
Width="125px" DefaultMode="Insert">
<Fields>
<asp:BoundField DataField="user_id" HeaderText="user_id" InsertVisible="False"
ReadOnly="True" SortExpression="user_id" />
<asp:BoundField DataField="user_name" HeaderText="user_name"
SortExpression="user_name" />
<asp:BoundField DataField="user_pass" HeaderText="user_pass"
SortExpression="user_pass" />
<asp:BoundField DataField="user_email" HeaderText="user_email"
SortExpression="user_email" />
<asp:CommandField ButtonType="Button" ShowInsertButton="True" />
</Fields>
</asp:DetailsView>
<div ID="Div1" runat="server"></div>
<asp:AccessDataSource ID="AccessDataSource1" runat="server"
DataFile="~/App_Data/esn.mdb"
SelectCommand="SELECT * FROM [user]"
InsertCommand="INSERT INTO [user] ([user_name], [user_pass], [user_email]) VALUES (#user_name, #user_pass, #user_email)">
<InsertParameters>
<asp:Parameter Name="user_name" Type="String" />
<asp:Parameter Name="user_pass" Type="String" />
<asp:Parameter Name="user_email" Type="String" />
</InsertParameters>
</asp:AccessDataSource>
<asp:GridView ID="GridView1" runat="server"
AutoGenerateColumns="False" DataKeyNames="user_id"
DataSourceID="AccessDataSource1">
<Columns>
<asp:BoundField DataField="user_id" HeaderText="user_id" InsertVisible="False"
ReadOnly="True" SortExpression="user_id" />
<asp:BoundField DataField="user_name" HeaderText="user_name"
SortExpression="user_name" />
<asp:BoundField DataField="user_pass" HeaderText="user_pass"
SortExpression="user_pass" />
<asp:BoundField DataField="user_email" HeaderText="user_email"
SortExpression="user_email" />
</Columns>
</asp:GridView>
</form>

Answer 1

I think sendig user to a success insert page is an option!
Try look here:
detect duplicate insert
or here:
ASP.Net - Prevent Duplicate(Double) Inserts when Page is refreshed
How to Prevent Duplicate Record Insertion on Refresh Click in Browser in ASP.Net ?
Here a Microsoft article:
Trap the Browser Refresh

Answer 2

use viewstate or session to store a flag "hasSaved". when the page loads for the first time :
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
ViewState["hasSaved"] = false;
}
and change the value of "hasSaved" to true when the the data is saved note that save the value if "hasSaved" is false
See the full code here
Avoid Repeated insertion due to page refresh