can i use the object declared in one form in another form,windows forms

for example

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    public object C1
    {
        get;
        private set;
    }
}

Form1
-----------

Define Connection object as objConnection in the First Form.
Add a button and Write the code on the Button Click Event.

SqlConnection objCon=new SqlConnection(//Define credentials);
Form2 objfomr2=new Form2(objCon);
objfomr2.Show();

Form2
-------------
Define the parameterised constructor and get the value of the same connection object as below.
Declare a connection reference object as conref.

SqlConnection con;
public Form2(SqlConnection con)
{
InitializeComponent();
this.conref= con;
}

This Connection object conref has the same value as in Form1.

Passing Data Between Forms

Hope this article will helps