窗体传值
我有两个form,   一个form1,上面有两个button,   一个form2,上面有一个listBox,上面有一些item，我想点击button1时，form2出现，当点击button2时，form2上面的listBox中的item被清空。怎么做？？

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http://topic.csdn.net/t/20041027/19/3497195.html
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Form2 test = new Form2();
private void button1_Click(object sender, EventArgs e)
{

test.Show();
}

private void button2_Click(object sender, EventArgs e)
{
((ListBox)test.Controls[ "listBox1 "]).Items.Clear();
}
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=============================给你一个参考 ,窗体之间 传值-====================
namespace ReadFile
{
public partial class Form2 : Form
{


public Form2()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{

Form3 fm = new Form3();
fm._val = this.textBox1.Text;
if (fm.ShowDialog() == DialogResult.OK)
{
this.textBox1.Text = fm._val;
}


}
}
}


namespace ReadFile
{
public partial class Form3 : Form
{
// 定义一个属性
public string _val;
public string val
{
get
{
return _val;
}
set
{
_val = value;
}
}

public Form3()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
_val = this.textBox1.Text;
this.DialogResult = DialogResult.OK;
this.Hide();
}

private void Form3_Load(object sender, EventArgs e)
{
this.textBox1.Text = _val;
}


}
}