Question

I want to display a ballon tip when an error occures instead of showing MessageBox.

[NOTE] i did not want it to be shown on mouse Hover.

I tried both but they actually show the tip on mouse hover

toolTip1.SetToolTip();
toolTip1.Show();

Answer 1

You can use the ToolTip Popup event to check if there is a Tooltip present and cancel it if there isn’t. You can then set the tooltip during your validation then show it. In this example I set a timer to reset the tooltip text after a 2 second timeout.

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        toolTip1.IsBalloon = true;
        toolTip1.Popup += new PopupEventHandler(toolTip1_Popup);
        toolTip1.SetToolTip(textBox1, "");
    }

    void toolTip1_Popup(object sender, PopupEventArgs e)
    {
        if (toolTip1.GetToolTip(e.AssociatedControl) == "")
            e.Cancel = true;

    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        timer1.Stop();
        toolTip1.RemoveAll();

    }

    private void textBox1_Validating(object sender, CancelEventArgs e)
    {
        int temp;
        if (!int.TryParse(textBox1.Text, out temp))
            showTip("Validation Error", (Control)sender);

    }

    private void showTip(string message, Control destination)
    {
        toolTip1.Show(message, destination);
        timer1.Start();
    }
}