Part one: Create the dialog.
1) Right click your project in the Solution explorer.
2) Select "Add" then "New Windows Form".
3) When the dialog appears, change the name to "CustomerInfoDialog.cs" and press "Add"
4) Add your controls and code to your dialog.
Part two: Display the dialog:
1) In the method where you want to bring up the dialog, add the code:
CustomerInfoDialog cid = new CustomerInfoDialog();
if (cid.ShowDialog() == DialogResult.OK)
{
...
}
You may want to add info to your dialog, or take info from your dialog after display - I can't help you there since I don't know what you are trying to do with it!