How do I fire a message box with if else condition and timespan value?

<pre>private void timer2_Tick(object sender, EventArgs e)
        {
//start time is another DateTime.now
//timeSinceStart is an array of timeSpan
//i believe that the for loop is for me to be able to create and store many values for //the timespan and update the listview items(see link below for the photo of the form)
            for (int w = 0; w < listView1.Items.Count; w++)
            {
                timeSinceStart[w] = DateTime.Now - startTime[w];
                listView1.Items[w].SubItems[6].Text = (timeSinceStart[w].TotalSeconds.ToString());
                if (f.ToString() == listView1.Items[w].SubItems[6].Text)
                {
//you can ignore the mysql codes here
//f.ToString() is default 60(its an integer)
                    string constring = "server=localhost;database=dbhorizon;uid=root;password=1234";
                    string Query = "update tblUserIdd set User_Available = 'Available' where User_ID='" + listView1.Items[w].SubItems[0].Text + "' ";

                    MySqlConnection conDatabase = new MySqlConnection(constring);
                    MySqlCommand cmdDatabase = new MySqlCommand(Query, conDatabase);
                    MySqlDataReader myReader;

                    conDatabase.Open();
                    myReader = cmdDatabase.ExecuteReader();
                    dgvref();
//this is what matters 
                    MessageBox.Show("dedede");
                }
                else
                {
                    label3.Text = timeSinceStart[w].TotalSeconds.ToString();
                }
            }