How do I show a Loading please wait message in Winforms for a long loading form

Question

I have a form that is very slow because there are many controls placed on the form     As a result the form takes a long time to loaded    How do I load the form first  then display it and while loading delay show another form which that have message like  Loading    please wait

User · Answer

You should create a background thread to to create and populate the form  This will allow your foreground thread to show the loading message

User · Answer

A simple solution   using  Form2 f2   new Form2          f2 Show        f2 Update         System Threading Thread Sleep 2500        f2 is closed and disposed here   And then substitute your Loading for the Sleep  This blocks the UI thread  on purpose

User · Answer

I know it is wery late  but I fonded this project and I would like to share with you  it is very usefull and sample  Simple Display Dialog of Waiting in WinForms

User · Answer

I put some animated gif in a form called FormWait and then I called it as      show the form new Thread      gt  new FormWait   ShowDialog    Start        do the heavy stuff here     get the form reference back and close it FormWait f   new FormWait    f    FormWait Application OpenForms  FormWait    f Close

User · Answer

Well i do it some thing like this          NormalWaitDialog  your wait form    frmWaitDialog   null              Btn Load Click Event          frmWaitDialog   new NormalWaitDialog             frmWaitDialog Shown    async  s  ee    gt                        await Task Run      gt                                 DO YOUR STUFF HERE                    Made long running loop to imitate lengthy process                int x   0                 for  int i   0  i  lt  int MaxValue  i                                        x    i                                  ConfigureAwait true                frmWaitDialog Close                        frmWaitDialog ShowDialog this

User · Answer

Using a separate thread to display a simple please wait message is overkill especially if you don t have much experience with threading   A much simpler approach is to create a  Please wait  form and display it as a mode-less window just before the slow loading form   Once the main form has finished loading  hide the please wait form   In this way you are using just the one main UI thread to firstly display the please wait form and then load your main form     The only limitation to this approach is that your please wait form cannot be animated  such as a animated GIF  because the thread is busy loading your main form   PleaseWaitForm pleaseWait new PleaseWaitForm         Display form modelessly pleaseWait Show         ALlow main UI thread to properly display please wait form  Application DoEvents        Show or load the main form  mainForm ShowDialog

User · Answer

The best approach when you also have an animated image is this one   1- You have to create a  WaitForm  that receives the method that it will executed in background  Like this one  public partial class WaitForm   Form       private readonly MethodInvoker method       public WaitForm MethodInvoker action                InitializeComponent            method   action             private void WaitForm Load object sender  EventArgs e                new Thread      gt                        method Invoke                InvokeAction this  Dispose              Start               public static void InvokeAction Control control  MethodInvoker action                if  control InvokeRequired                        control BeginInvoke action                     else                       action                        2 - You can use the Waitform like this  private void btnShowWait Click object sender  EventArgs e        new WaitForm      gt    Simulate long task   Thread Sleep 2000   ShowDialog

User · Answer

You can take a look at my splash screen implementation  C  winforms startup  Splash  form not hiding

User · Answer

I looked at most the solutions posted  but came across a different one that I prefer   It s simple  doesn t use threads  and works for what I want it to   http   weblogs asp net kennykerr archive 2004 11 26 where-is-form-s-loaded-event aspx  I added to the solution in the article and moved the code into a base class that all my forms inherit from   Now I just call one function  ShowWaitForm   during the frm load   event of any form that needs a wait dialogue box while the form is loading   Here s the  code   public class MyFormBase   System Windows Forms Form       private MyWaitForm  waitForm       protected void ShowWaitForm string message                   don t display more than one wait form at a time         if   waitForm    null  amp  amp    waitForm IsDisposed                         return                      waitForm   new MyWaitForm             waitForm SetMessage message       Loading data  Please wait              waitForm TopMost   true           waitForm StartPosition   FormStartPosition CenterScreen           waitForm Show             waitForm Refresh                force the wait window to display for at least 700ms so it doesn t just flash on the screen         System Threading Thread Sleep 700                    Application Idle    OnLoaded             private void OnLoaded object sender  EventArgs e                Application Idle -  OnLoaded           waitForm Close              MyWaitForm is the name of a form you create to look like a wait dialogue   I added a SetMessage   function to customize the text on the wait form

User · Answer

or if you don t want anything fancy like animation etc  you can create a label and dock it to form then change it s z-index from document outline window to 0 and give it a background color so other controls wont be visible than run Application DoEvents   once in form load event and do all your coding in form shown event and at the and of shown event set your label visible property to false then run Application DoEvents   again

User · Answer

You want to look into  Splash  Screens   Display another  Splash  form and wait until the processing is done   Here is an example on how to do it

User · Answer

Another way of making  Loading screen  only display at certain time is  put it before the event and dismiss it after event finished doing it s job   For example  you want to display a loading form for an event of saving result as MS Excel file and dismiss it after finished processing  do as follows   LoadingWindow loadingWindow   new LoadingWindow     try       loadingWindow Show                        this exportToExcelfile        loadingWindow Close      catch  Exception ex        MessageBox Show  Exception EXPORT      ex Message       Or you can put loadingWindow Close   inside finally block

[c#] How do I show a "Loading . . . please wait" message in Winforms for a long loading form?

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