Update Label Text while processing using C# and VB.Net in ASP.Net

Hi Amit,

Here i have created sample for your reference. Refer the below code.

HTML

<div>
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <asp:Timer runat="server" ID="Timer1" Interval="1000" Enabled="false" OnTick="Timer1_Tick" />
    <br />
    <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always">
        <Triggers>
            <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
        </Triggers>
        <ContentTemplate>
            <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
            <br />
            <br />
            <asp:Label ID="lable1" runat="server" />
        </ContentTemplate>
    </asp:UpdatePanel>
</div>

Code

C#

protected static string content;
protected static bool inProcess = false;
protected static bool processComplete = false;
protected static string processCompleteMsg = "Finished Processing.";

protected void Page_Load(object sender, EventArgs e) { }

protected void Button1_Click(object sender, EventArgs e)
{
    processComplete = false;
    Button1.Enabled = false;
    Timer1.Enabled = true;
    Thread workerThread = new Thread(new ThreadStart(ProcessRecords));
    workerThread.Start();
}

protected void ProcessRecords()
{
    inProcess = true;
    int x = 10; // Loop start value.
    for (int i = x; i > 0; i--)
    {
        Thread.Sleep(1000); // Thread sleep time.
        content = (i * 75).ToString(); // Multiplication of 75.
    }
    processComplete = true;
    content = processCompleteMsg;
}

protected void Timer1_Tick(object sender, EventArgs e)
{
    if (inProcess)
    {
        lable1.Text = content;
    }

    int msgLen = processCompleteMsg.Length;
    if (processComplete && lable1.Text.Substring(lable1.Text.Length - processCompleteMsg.Length) == processCompleteMsg)
    {
        inProcess = false;
        Timer1.Enabled = false;
        Button1.Enabled = true;
    }
}

VB.Net

Protected Shared content As String
Protected Shared inProcess As Boolean = False
Protected Shared processComplete As Boolean = False
Protected Shared processCompleteMsg As String = "Finished Processing."

Protected Sub Page_Load(sender As Object, e As EventArgs)
End Sub

Protected Sub Button1_Click(sender As Object, e As EventArgs)
	processComplete = False
	Button1.Enabled = False
	Timer1.Enabled = True
	Dim workerThread As New Thread(New ThreadStart(AddressOf ProcessRecords))
	workerThread.Start()
End Sub

Protected Sub ProcessRecords()
	inProcess = True
	Dim x As Integer = 10
	' Loop start value.
	For i As Integer = x To 1 Step -1
		Thread.Sleep(1000)
		' Thread sleep time.
			' Multiplication of 75.
		content = (i * 75).ToString()
	Next
	processComplete = True
	content = processCompleteMsg
End Sub

Protected Sub Timer1_Tick(sender As Object, e As EventArgs)
	If inProcess Then
		lable1.Text = content
	End If

	Dim msgLen As Integer = processCompleteMsg.Length
	If processComplete AndAlso lable1.Text.Substring(lable1.Text.Length - processCompleteMsg.Length) = processCompleteMsg Then
		inProcess = False
		Timer1.Enabled = False
		Button1.Enabled = True
	End If
End Sub

Screenshot