When I am calling Form2 from From1 by clicking the button, first time it is showing the data. Next time when I click the button, its throwing the following error..

Caught: Cannot access a disposed object named "Form2".
Object name: "Form2".

void button1_Click(object sender,system.EventArgs e)
  {  form2.Show();
  }catch (ObjectDisposedException err)
   {Console.WriteLine("Caught: {0}", err.Message);}

I have tried the ShowDialog method also. In that case it is appending the same data again.

When I click the button from Form1, it shows 4 records in Form2 (in datagrid). When I click it again it appends the same records. so I see 8 records.

Pl suggest.

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What is the Definition of Form2?
Is Form2 the name of your Form?
If you are probably want to define your variable something like this

private Form2 myform = new Form2();

in your Form1 class
Then whenever you call your ShowCode go

Also on another note.
You might change the OnClosing and have it autohide on the user hitting the okay button or hitting the Close button

from .NET Framework Class Library:

Note:   When the Close method is called on a Form displayed as a modeless window, you cannot call the Show method to make the form visible, because the form's resources have already been released. To hide a form and then make it visible, use the Control.Hide method.

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