C#

<br />
ArrayList Men;<br />
.<br />
.<br />
.<br />
private void button1_Click(object sender,System.EventArgs e)<br />
{<br />
man m = new man;<br />
m.Name = textbox1.Text;<br />
m.length = int.parse(textbox2.text);<br />
Men.Add(m);<br />
}<br />

<br />
private man Find(string key)<br />
{<br />
foreach (man m in Men)<br />
{<br />
if (m.Name == key)<br />
{<br />
return m;<br />
}<br />
}<br />
return null;        // didn't find it<br />
}<br />

private void SetParameter(string name, string val)
{
	ParameterFieldDefinitions paramFlds = report.DataDefinition.ParameterFields; // Get the parameter fields
	ParameterFieldDefinition paramFld = paramFlds[name]; // Get a specific one
	ParameterDiscreteValue discreteValue = new ParameterDiscreteValue(); // Create a value type
	ParameterValues paramValues = paramFld.CurrentValues; // Get the collection of current values
	paramValues.Clear(); // Clear the current
	discreteValue.Value = val; // Set the value
	paramValues.Add(discreteValue); // Add the value type
	paramFld.ApplyCurrentValues(paramValues); // Apply the parameters to the document
}

openFileDialog1.InitialDirectory = "c:\\" ;
openFileDialog1.Filter = "CSharp files (*.cs)|*.cs" ;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
    {
       // do your work here
       //OpenFileDialog have properties and method that    wil let yo work with file like get file name,opern it..etc

    }
For More info look at <a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwindowsformsopenfiledialogclasstopic.asp" rel="nofollow">OpenFileDialog Class</a>[<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwindowsformsopenfiledialogclasstopic.asp" target="_blank" rel="nofollow" title="New Window">^</a>]

const int WM_SYSCOMMAND  = 0x0112;
const int SC_CLOSE    =    0xF060;

protected override void WndProc(ref Message m)
{
	if(m.Msg==WM_SYSCOMMAND)
	{
		if(m.WParam.ToInt32()==SC_CLOSE)
		{
		      MessageBox.Show("Application will be close");
                       // call the default after you handle it			
                       base.WndProc(ref m);
		}
	}
	else
	{
		base.WndProc (ref m);
	}
}

protected override void WndProc(ref Message m)
{
	if(m.Msg==WM_SYSCOMMAND)
	{
		if(m.WParam.ToInt32()==SC_CLOSE)
		{
		      MessageBox.Show("Application will be close");
                }
			
	}
        base.WndProc (ref m);
}