[Solved] TextBox outside ASP.Net UpdatePanel is refreshing

Hi nauna,

I have checked th code its working correctly.

Make sure you don't have assigned PostBackTrigger to UpdatePanel.

Check this example. Now please take its reference and correct your code.

HTML

<asp:ScriptManager runat="server" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
    </Triggers>
    <ContentTemplate>
        <asp:Label ID="lblTime" runat="server" />
        <asp:Timer ID="Timer1" runat="server" Interval="1000" OnTick="UpdateTimer_Tick">
        </asp:Timer>
    </ContentTemplate>
</asp:UpdatePanel>
<br />
<asp:TextBox ID="txtmilesearch" runat="server" Text="300" CssClass="form-control"></asp:TextBox>

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        lblTime.Text = DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss");
    }
}


protected void UpdateTimer_Tick(object sender, EventArgs e)
{
    lblTime.Text = DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss");
}

VB.Net

Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
    If Not IsPostBack Then
        lblTime.Text = DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss")
    End If
End Sub

Protected Sub UpdateTimer_Tick(sender As Object, e As System.EventArgs)
    lblTime.Text = DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss")
End Sub

Screenshot