Retain (Keep) TextBox values after ASP.Net Button Click (PostBack) using C# and VB.Net

Hi harindaw,

In order to stop post back you need to make ajax call and save the data in database.

Or you can save the data in session and reuse to set the value in textboxes after postback.

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

HTML

<asp:TextBox runat="server" ID="txtName" />
<asp:Button Text="Save" runat="server" OnClick="OnSave" />
<asp:FileUpload ID="fuUpload" runat="server" />
<asp:Button Text="Upload" runat="server" OnClick="OnUpload" />

Code

C#

protected void OnSave(object sender, EventArgs e)
{
    Detail detail = new Detail();
    // Set TextBoxes values.
    detail.Name = txtName.Text.Trim();

    // Your insert code in database.

    // Save in Session.
    Session["Data"] = detail;
}

protected void OnUpload(object sender, EventArgs e)
{
    if (Session["Data"] != null)
    {
        Detail detail = (Detail)Session["Data"];
        txtName.Text = detail.Name;

        // File upload code.

        // Clear the session.
        Session["Data"] = null;
        txtName.Text = "";
    }
}

public class Detail
{
    public string Name { get; set; }
    // other properties.
}

VB.Net

Protected Sub OnSave(ByVal sender As Object, ByVal e As EventArgs)
    Dim detail As Detail = New Detail()
    detail.Name = txtName.Text.Trim()
    Session("Data") = detail
End Sub

Protected Sub OnUpload(ByVal sender As Object, ByVal e As EventArgs)
    If Session("Data") IsNot Nothing Then
        Dim detail As Detail = CType(Session("Data"), Detail)
        txtName.Text = detail.Name
        Session("Data") = Nothing
        txtName.Text = ""
    End If
End Sub

Public Class Detail
    Public Property Name As String
End Class