FormClosing Event in C# Window Application?

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I have build one small Win Form App with Threading. While processing the application if user clicked Close button on the Form then i must show warning Message box.

I have written below code and it is working fine. But problem is "Message box appears twice". How to overcome this.

C#

private void frmTranxitCCTVJobCreation_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (e.CloseReason != CloseReason.UserClosing)
                return;
            if (bIsButtonClicked == true)
            {
                if (_threadProcessCCTV.IsAlive)
                {
                    if (MessageBox.Show("Are you sure you want to close the form?", "Warning", MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.Yes)
                        e.Cancel = false;
                    else
                        // Cancel the Closing event from closing the form.
                        e.Cancel = true;
                }
            }
        }

Posted 22-Dec-13 20:55pm

mn.sathish

Updated 4-Sep-19 8:51am

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jackspero18 23-Dec-13 3:07am

Did you Tried...???

mn.sathish 23-Dec-13 3:15am

Ya...., I have done. Its working fine. Thanks for your help

2 solutions

Solution 2

DialogResult dialogResult = MessageBox.Show("Are you sure, you want to exit ?                  ", "Application Name", MessageBoxButtons.YesNo);

          if (dialogResult == DialogResult.Yes)
          {
              if (Application.OpenForms.Count == 0)
                  Application.Exit();
          }
          else if (dialogResult == DialogResult.No)
          {
              e.Cancel = true;
          }

Posted 4-Sep-19 8:52am

Member 14235971

Comments

CHill60 5-Sep-19 6:25am

You will still get the message twice because you have not interrogated the reason for closing.
If the number of OpenForms is not 0 (which it won't be) then you will still exit the application - follow the code through.
Apart from these obvious errors, a code dump on an already answered post from 6 years ago is only going to attract downvotes and reports - you need to explain why your solution is better or different to the one already posted. You also need to make sure it works.

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jackspero18 · Accepted Answer · 2013-12-22T21:03:00

try this

C#

if(e.CloseReason == CloseReason.UserClosing)
            {
                dynamic result = MessageBox.Show("Do You Want To Exit?", "Application Name", MessageBoxButtons.YesNo );
                if (result == DialogResult.Yes )
                {
                    Application.Exit();
                }
              
                if (result == DialogResult.No)
                {
                    e.Cancel = true;
                }
            }