code for showing alert in windows forms using C#

Put a timer on the form and set it to execute every few seconds. Call your function from the Elapsed event of the time.

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        Timer timer;
 
        public Form1()
        {
            InitializeComponent();
 
            timer = new Timer();
            timer.Interval = 5000; //every 5 sec for example
            timer.Tick += new EventHandler(timer_Tick);
            timer.Enabled = true;
        }
 
        void timer_Tick(object sender, EventArgs e)
        {
            //put yor methode here..
        }
    }
}

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exactly :)
i was writing example :)

But i need code that gives alert automatically when disk space reaches 80%.

in the above code ,i have taken when the disk space is complete.

instead it shouls show alert when disk space reaches 80% of used space

if (driven.TotalFreeSpace < ((double)driven.TotalSize * 0.80d))
{
    df.Add(driven.Name.ToString() + ": Disk low free space. " + HumanReadableSize(driven.TotalFreeSpace));
}
 
public string HumanReadableSize(double len)
{
    string[] sizes = { "B", "KB", "MB", "GB" };
    int order = 0;
    while (len >= 1024 && order + 1 < sizes.Length)
    {
        order++;
        len = len / 1024;
    }
    string result = String.Format("{0:0.##} {1}", len, sizes[order]);
    return result;
 
}

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Cebi - Don't you think the expression should be:

if (driven.TotalFreeSpace < ((double)driven.TotalSize * 0.20d))

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sorry :)
100 - 80 = 20%

if (driven.TotalFreeSpace < (driven.TotalSize * 0.20d))
            {
                df.Add(driven.Name.ToString() + ": Disk low free space. " + HumanReadableSize(driven.TotalFreeSpace));
            }

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The problem here is

in any case it is running only else part

else
                        {

                            df.Add(driven.Name.ToString() + " Drive is Full . Please check");
                        }

even if i take 0.2 or 0.8 it is giving only else part as output

atached is my code in timer1

private void timer1_Tick(object sender, EventArgs e)
        {

            {

                ArrayList df = new ArrayList();
                DriveInfo[] driveListess = DriveInfo.GetDrives();





                // Loop through the list of drives


                foreach (DriveInfo driven in driveListess)
                {
                    try
                    {
                        if (driven.TotalFreeSpace < (driven.TotalSize * 0.20d))



                        {
                           
                            df.Add(driven.Name.ToString() + " Please check");
                        }
                        else
                        {

                            df.Add(driven.Name.ToString() + " Drive is Full . Please check");
                        }

                    }



                    catch (Exception ex)
                    {
                        FreeSpace = 0;
                        TotalSize = 0;
                        UsedSpace = 0;
                        Sweep = 0;
                        lblFileSystem.Text = "N/A";
                        lblFreeSpace.Text = "N/A";
                        lblUsedSpace.Text = "N/A";
                        lblTotalSize.Text = "N/A";
                    }

                }
                string Alertmsg = "      ";

                foreach (string str in df)
                {
                    Alertmsg += str + Environment.NewLine;

                }
                MessageBox.Show(Alertmsg.ToString(), "Alert", MessageBoxButtons.OK, MessageBoxIcon.Warning);

            }  

        }

it should only show alert when disk reaches 80% , rest of that it should not show any alert