I tried what you given here.but the form is not hiding.it works properly.may be you can explain how ur code works.
private void DoEdit(CheckingFieldsResult result)
{
switch (result)
{
case CheckingFieldsResult.DurationError:
MessageBox.Show("Possible Errors:\r\n\t1:Duration less than (current position- trimIn+ 5)\r\n\t2:Duration more than TotalFrames\r\n\t3:Duration = trimIn", "ICTechPlayer", MessageBoxButtons.OK, MessageBoxIcon.Information);
break;
case CheckingFieldsResult.TrimInError:
MessageBox.Show("TrimIn must be more than zero, and less than (trimOut- duration- 5", "ICTechPlayer", MessageBoxButtons.OK, MessageBoxIcon.Information);
break;
is that clear ?
Are you sure the form hides? I think the form would actually close.
ShowDialog is waiting for a button press of some kind, I don't know hte exact details but basically the MessageBox is sending the button click through the forms and propagating. The behaviour then closes your modal dialog as well.
In the past I have either not used ShowDialog(); or do not use a MessageBox.
Either implement a status bar perhaps or a label to show your message. If the MessageBox result is required whereby you have a yes or no question perhaps, instead you can use a checkbox on the form.
The problem is very annoying though 
The final third and great option I can offer is instead of using the MessageBox you can create your own message box form and show it.
To prevent a form from closing use the following event handler for FormClosing event:
private
void YourForm_FormClosing(object sender, FormClosingEventArgs e){
true;e.Cancel =
}
that will prevent the form from closing. You better sue a conditional statement as if you leave it like this it will never close.
