C#

Heath Stewart wrote:

Because you have a backslash at the beginning, which means the search starts
from the root of the drive. For example, if your web root is locally on the C:
drive, then you're code is looking for C:\Files\whatever. I doubt that's
what you want.
 
If your files root is under your web application
root - not generally a good idea since people then have direct access at least
for file extensions not configured with your server software (ex: IIS) - you can
use ~ to resolve the path like so:
 

<SPAN class=code-comment>//</SPAN><SPAN class=code-comment> Assumes you're running this from within an ASP.NET Page
</SPAN>string root = Server.MapPath(<SPAN class=code-string>"</SPAN><SPAN class=code-string>~/Files"</SPAN>);
string path = Path.Combine(root, filename);
<SPAN class=code-keyword>if</SPAN> (File.Exists(path))
{
  File.Delete(path);
}

 
It's also a good idea to use Path.Combine, which works on any
manage host environment (though Windows is most typical) and takes care of any
trailing backslashes since double backslashes in some use cases can cause
problems (referencing back to root, for example).

private void SetImageLocation(string uri)
{
  if (pictureBox1.InvokeRequired)
  {
    Action<string> setImageLocation = SetImageLocation;
    pictureBox1.Invoke(setImageLocation, new object[] { uri });
  }
  else
  {
    pictureBox1.ImageLocation = uri;
  }
}

private void DoWork()
{
  for (int i = 0; i < 20000; ++i)
  {
    if (i == 5000)
    {
      SetImageLocation("x.gif");
    }
  }
}

// Assumes you're executing work in response to a Button.Click event.
private void button1_Click(object sender, EventArgs e)
{
  ThreadPool.QueueUserWorkItem(DoWork);
}

int i = 0;
            while (i<2000000000)
            {
                if (i==5000) {
                    pictureBox1.Load("x.gif");

                    Application.DoEvents();

                }
                
                i++;
            }

abdellah ab wrote:

if (i=5000) {

internal abstract class MyFormBase : Form
{
  DataGridView dataGridView1;

  protected MyFormBase()
  {
    dataGridView1 = new DataGridView();
    dataGridView1.CellClick += OnDataGridViewCellClick;
    // Other initialization
  }

  protected virtual string Message
  {
    get { return "Message from the base class."; }
  }

  protected virtual void OnDataGridViewCellClick(object sender, DataGridViewCellEventArgs e)
  {
    // Override this in your child class if you wish.
  }

  protected virtual void OnDataGridViewColumnHeaderMouseClick(object sender, DataGridViewBindingCompleteEventArgs e)
  {
    MessageBox.Show(Message, "Test");
  }
}

internal class MyChildForm : MyFormBase
{
  protected override string Message
  {
    get { return "Message from the child class."; }
  }

  protected override void OnDataGridViewCellClick(object sender, DataGridViewCellEventArgs e)
  {
    MessageBox.Show("You clicked a cell.", "Test");

    // Example of how to call a base method. Not always required, and in this case doesn't do anyway.
    // However, for some virtual methods it's very important to call the base so read documentation.
    base.OnDataGridViewCellClick(sender, e);
  }
}

private abstract void OnDataGridViewCellClick(object sender, DataGridViewCellEventArgs e);