How to Publish an application in Visual Studio

Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "AutoUpdate" and then click OK

Step 2: Design a simple form as below

Step 3: Add code to handle button event

private void button1_Click(object sender, EventArgs e)
{
    UpdateCheckInfo info;
    if (ApplicationDeployment.IsNetworkDeployed)
    {
        ApplicationDeployment ad = ApplicationDeployment.CurrentDeployment;
        try
        {
            info = ad.CheckForDetailedUpdate();
        }
        catch (DeploymentDownloadException dde)
        {
            MessageBox.Show("The new version of the application can't be downloaded at this time.\n\nPlease check your network connection or try again later. Error: " + dde.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
        }
        catch (InvalidDeploymentException ide)
        {
            MessageBox.Show("Can't check for a new version of the application. The ClickOnce deployment is corrupt. Please redeploy the application and try again. Error: " + ide.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
        }
        catch (InvalidOperationException ioe)
        {
            MessageBox.Show("This application can't be updated. It's likely not a ClickOnce application. Error: " + ioe.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
        }
        if (info.UpdateAvailable)
        {
            if (MessageBox.Show("A newer version is available. Would you like to update it now ?", "Message", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
            {
                try
                {
                    ad.Update();
                    Application.Restart();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }
        else
            MessageBox.Show("You are running the latest version.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
}

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