Thanks & Regards,

Dipak Patil

Hi Dipak_Patil,

Thank you for providing much information about your issue. From your description, the operations those would often cost too much time, such as contrls loading, database updating, are all done in the Load, Closing, Closed event handlers. But these events would not be fired when we switch from one form to another in a general case. Instead, the activated and deactivate events would be fired.

Based on my understanding, we need to trace the code executing and figure out which part costs most of the time. These are the steps:
1. Add some code to the start of some event handlers or methods to show whether they are executed when we switch a form. The code can be like this:
Console.WriteLine("method name");
Then you can see the output messages in the Output window of the visual studio.
2. In the methods or handlers those are executed when we switch a form, output the time a code snippet costs by adding code like below:

    public class Form99 : Form
    {
        private DateTime _time;

        private void Form99_Load(object sender, EventArgs e)
        {
            //Save the start time.
            _time = DateTime.Now;
            
            //Executs some code about loading controls here.

            //Output executing time.
            Console.WriteLine(String.Format("Loading controls costs time:{0}", DateTime.Now - _time));
            //Reset the time.
            _time = DateTime.Now;
        }
    }

Hi,

We are changing the issue type to “General Discussion�because you have not followed up with the necessary information. If you have more time to look at the issue and provide more information, please feel free to change the issue type back to “Question�by opening the Options list at the top of the post window, and changing the type. If the issue is resolved, we will appreciate it if you can share the solution so that the answer can be found and used by other community members having similar questions.

Aland Li