您可以将它们声明为公共或属性

you can declare them as public or as a property

例如

for example

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

    public object C1
    {
        get;
        private set;
    }
}

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

在第一个表单中将Connection对象定义为objConnection.
添加一个按钮，并在按钮单击事件"上编写代码.

SqlConnection objCon =新的SqlConnection(//定义凭据);
Form2 objfomr2 =新Form2(objCon);
objfomr2.Show();

Form2
-------------
定义参数化的构造函数，并获取与下面相同的连接对象的值.
将连接引用对象声明为conref.

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

此Connection对象conref具有与Form1中相同的值.

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.