C# 跨窗体传值问题！

[渃水]

我想把本窗体中的字符串strselected传给ContractAddForm，是这么写的，但是这句报错

        ContractAddForm contractAddForm;
         ……
         ……
        contractAddForm.strselect = strselected;         

        public string strselect { get { return _strselect; } set { _strselect = value; } }

[devmiao]

contractAddForm没有初始化。 contractAddForm = Application.OpenForms.Cast<Form>().FirstOrDefault(x => x is ContractAddForm); if (contractAddForm == null) contractAddForm = new ContractAddForm();

[渃水]

引用 1 楼 devmiao 的回复:

contractAddForm没有初始化。 contractAddForm = Application.OpenForms.Cast<Form>().FirstOrDefault(x => x is ContractAddForm); if (contractAddForm == null) contractAddForm = new ContractAddForm(……

已经打开了一个ContractAddForm窗体，为父窗体，通过点击ContractAddForm上的一个按钮打开了另一个子窗体，现在想把子窗体的值传回父窗体，该怎么做？谢谢

[三五月儿]

winform窗体间传值http://www.cnblogs.com/tomin/archive/2009/02/25/1397677.html