how to communicate data between forms?

I want to pass some values to开发者_运维技巧 different forms at there button click event. plz guide me.I am using c sharp.net 2005,win forms. I want to access the value in a sql query in form 2 received from form 1 variable.

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You have several options:

• pass the data to the constructor of the child form
• expose a instance property in the parent form, then pass that form as an argument to the child form
• expose a static property in the parent form

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Use delegate. Thats the best way you could talk. Or as suggested, if form2 is a child of form1, then ctor argument based. If its 2 independent, then delegates.

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You can pass it through the constructor of the child form if the data is mandatory, or through a property if it is optional.

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Try this code, you have to do something like following code : inside this event you have to pass data to other

    private void button1_Click(object sender, EventArgs e)
    {
        Form2 secondForm = new Form2();
        secondForm.YourProperty = "This is your data";
        secondForm.Show();
    }

In the other form you have to declare a property :

    public string YourProperty { get; set; }

hope this help.