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c#showdialog

Using ShowDialog() in C# to display a message

I want to use show dialog () to display a message in another form. How do I show the message? Here's what I've tried.

//return total 
return total; 

//change total to string 
total = total.ToString;

//create an instance of the MessageForm class
MessageForm myMessageForm = new MessageForm();

//Display the form
myMessageForm.ShowDialog(total);

This gives me an error message. i don't know how to go about showing the total in the other form. Any suggestions?

Solution

  • The value of total you're passing in is supposed to be the owner of this new form.

    You probably want to achieve this:

    // remove the return line

total = total.ToString();

//create an instance of the MessageForm class
MessageForm myMessageForm = new MessageForm();

// set the total value which is now a property on message form
myMessageForm.Total = total;

//Display the form
myMessageForm.ShowDialog();

    You would also have to add this new property to MessageForm class

    // decide the visibility yourself (e.g. public vs internal)
internal string Total { get; set; }

    You should also consider whether you want to pass total in the constructor as opposed to a property. If you have other existing classes calling MessageForm, this mayrequire some refactoring.