Use parametrized constructor to send data from one from to another .You can use code as follows (Sending form)
Inventory_Info_Form inventory_Info_Form = new Inventory_Info_Form(part_NumberComboBox.Text,part_DescriptionTextBox.Text);
while (inventory_Info_Form.ShowDialog() != DialogResult.OK)
{
}
So you need to define a parametrized constructor for the form named Inventory_Info_Form . To do you know you can define a parametrized like bellow(Receiving form)
public Inventory_Info_Form(string combotext,string descriptionText)
{
inventory_Info_Form.part_NumberComboBox.Text= combotext;
inventory_Info_Form.part_DescriptionTextBox.Text = descriptionText;
}
Hope it works! Happy Coding :)