How to call window alert message from C

Question

I have my own exception based on some condition and want to raise an alert when control comes in this catch block   catch  ApplicationException ex          want to call window alert function here

User · Answer

You can use the following extension method from any web page or nested user control:

static class Extensions
{
    public static void ShowAlert(this Control control, string message)
    {
        if (!control.Page.ClientScript.IsClientScriptBlockRegistered("PopupScript"))
        {
            var script = String.Format("<script type='text/javascript' language='javascript'>alert('{0}')</script>", message);
            control.Page.ClientScript.RegisterClientScriptBlock(control.Page.GetType(), "PopupScript", script);
        }
    }
}

like this:

class YourPage : Page
{
    private void YourMethod()
    {
        try
        {
            // do stuff
        }
        catch(Exception ex)
        {
            this.ShowAlert(ex.Message);
        }
    }
}

User · Answer

MessageBox like others said  or RegisterClientScriptBlock if you want something more arbitrary  but your use case is extremely dubious  Merely displaying exceptions is not something you want to do in production code - you don t want to expose that detail publicly and you do want to record it with proper logging privately

User · Answer

Do you mean  a message box   MessageBox Show  Error Message    Error Title   MessageBoxButtons OK  MessageBoxIcon Exclamation     More information here  http   msdn microsoft com en-us library system windows forms messagebox v VS 100  aspx

User · Answer

It s a bit hard to give a definitive answer without a bit more information  but one usual way is to register a startup script   try           catch ApplicationException ex     Page ClientScript RegisterStartupScript this GetType    ErrorAlert   alert  Some text here - maybe ex Message     true

User · Answer

You should try this   ClientScript RegisterStartupScript this GetType     myalert    alert  Sakla Test      true

User · Answer

You can also do this      catch  Exception ex                 ScriptManager RegisterStartupScript Page  Page GetType     showError               alert      ex Message          true            this will show the exeption message in the alert box

User · Answer

You can try this   Hope it works for you       private void validateUserEntry            Checks the value of the text      if serverName Text Length    0               Initializes the variables to pass to the MessageBox Show method      string message    You did not enter a server name  Cancel this operation        string caption    Error Detected in Input       MessageBoxButtons buttons   MessageBoxButtons YesNo      DialogResult result          Displays the MessageBox      result   MessageBox Show message  caption  buttons       if  result    System Windows Forms DialogResult Yes                Closes the parent form          this Close

User · Answer

I m not sure if I understand but I m guessing that you re trying to show a MessageBox from ASP Net   If so  this code project article might be helpful  Simple MessageBox functionality in ASP NET

User · Answer

Simple use this to show the alert message box in code behind   ScriptManager RegisterStartupScript this  this GetType     script    alert  Record Saved Sucessfully      true

User · Answer

if you are using ajax in your page that require script manager Page ClientScript will not work  Try this and it would do the work   ScriptManager RegisterClientScriptBlock this  GetType                 alertMessage     alert  your Message      true

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