C#

taibc wrote:

but it is not successful

string sourceFile, destinationFile;

       private void ShowLoadingIcon()
       {
           if (InvokeRequired)
           {
               this.Invoke(new MethodInvoker(ShowLoadingIcon));

           }
           else
           {
               pixLoadingIcon.Visible = true;
           }
       }



       private void btnConvert_Click(object sender, EventArgs e)
       {
           ShowLoadingIcon();

           //start thread to process long running task
           System.Threading.Thread t = new System.Threading.Thread(() =>
           {
               ConvertFiles(sourceFile, destinationFile);
           });

           t.Start();

       }


       private void ConvertFiles(string src, string dest)
       {
           //long running task to convert files
       }

/// <summary>
/// delegate to invoke when invoke required
/// </summary>
private delegate void ChangeTextDel(System.Windows.Forms.TextBox obj, string newtext);

/// <summary>
/// Changes the text.
/// </summary>
/// <param name="obj">The obj.</param>
/// <param name="newtext">The newtext.</param>
private void ChangeText(System.Windows.Forms.TextBox obj, string newtext)
{
    if (obj.InvokeRequired)
    {
        obj.Invoke(new ChangeTextDel(ChangeText), new object[] { obj, newtext });
    }
    else
    {
        obj.Text = newtext;
    }
}

//from thread
ChangeText(txtLopDiaChi, "my new text value");

Error   9   'System.Windows.Forms.Form' does not contain a definition for 'lblFindWhat' and no extension method 'lblFindWhat' accepting a first argument of type 'System.Windows.Forms.Form' could be found (are you missing a using directive or an assembly reference?)   C:\Users\Jassim\Documents\Visual Studio 2010\Projects\Cure\Cure\main_form.cs    1682    37  Cure

public string Prompt
   {
   get { return myLabel.Text; }
   set { myLable.Text = value; }
   }

search_form.Prompt = "something";

foreach (Form form in this.MdiChildren)
{
    MySearchForm search_form = form as MySearchForm;
    if (search_form != null && (string)search_form.Tag == "BROWSE_PATIENTS")
    {
        search_form.Prompt = "something";
        search_form.Activate();
        is_form_exists = true;
        break;
    }
}

public enum ENRateType { Dollar, Percent }

public class Rate
{
    public ENRateType RateType;
    public double Rate;
}

Widget          $12.00
Shipping        $3.95
Subtotal        $15.95
Tax             8.875%
Total           $30.11

Collin Jasnoch wrote:

Because he has not stated his reason for layers but is trying to use it. That is
the point.

Collin Jasnoch wrote:

I have seen cases where an empty interface is even used. It is not over
engineering. It is creating a base API.
 

By what the OP was an
interface is exactly what should be used.

public class Rate
{
	public double Value; // Holds either the dollar or percentage value
	
	public override string ToString ()
	{
		string typeName = GetType().Name;
		// removes the prefix, if present
		if (typeName.StartsWith(typeof(Rate).Name))
			typeName = typeName.Substring(typeof(Rate).Name.Length);
		return typeName;
	}
}
// Console.WriteLine(myTransactionLine.Amount);
// would then result in "Dollar" as output

Bastard Programmer from Hell
if you can't read my code, try converting it here[^]