无法访问tabpage1上tabpage2的日期时间选择器的文本或值

Question

I have windows form containing tab control, having two tab pages

on form load event i passed value to datetimpicker1 exists on tab page 2

private void Form1_Load(object sender, EventArgs e)
    {
      dateTimePicker1.Text = "2014-05-14 00:00:00.000";    
    }

and on check button click event i have following code

 private void button2_Click(object sender, EventArgs e)
    { 
        MessageBox.Show(dateTimePicker1.Value.ToString());
        MessageBox.Show(dateTimePicker1.Text.ToString());
    }

output:

2)on navigating to tabpage2 & then click on check button

output:

& then after come back to tabpage1 & click on check it shows correct output

why it not showing at first time as we open form & clcik on check button without going to tab page 2

Your suggestions will be appreciated.

Answer 1

This is the quote from MSDN

Controls contained in a TabPage are not created until the tab page is shown, and any data bindings in these controls are not activated until the tab page is shown.

You can, for example, programmatically switch to tabPage2 and back to the first tab.

Answer 2

Check out MSDN Reference :

Controls contained in a TabPage are not created until the tab page is shown, and any data bindings in these controls are not activated until the tab page is shown.

In form load you can select your tab as well.

private void Form1_Load(object sender, EventArgs e)
    {
        tabControl1.SelectedTab = tabPage2;
        dateTimePicker1.Text = "2014-05-14 00:00:00.000";            
    }

Answer 3

Try this one

   private void button2_Click(object sender, EventArgs e)
    { 
        MessageBox.Show(dateTimePicker1.Value.ToString());
        MessageBox.Show(dateTimePicker2.Value.ToString());
     }