The following lines of code are supposed to create a DateTime variable and increment its hour value by two. Find the error(s) in the code.
DateTime dtmNow = DateTime.Now;
dtmNow.AddHours( 2 );
Method AddHours does not actually increment the DateTime variable, but instead
returns a new DateTime variable with the updated value. Thus, the preceding code will not successfully add two hours to dtmNow. The complete incorrect code reads:
// ChangeTime.cs (Incorrect)
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace ChangeTime
{
///
/// Summary description for FrmChangeTime.
///
public class FrmChangeTime : System.Windows.Forms.Form
{
private System.Windows.Forms.Label lblTwoHours;
private System.Windows.Forms.Label lblCurrentTime;
private System.Windows.Forms.Label lblTwoHoursText;
private System.Windows.Forms.Label lblCurrentText;
///
/// Required designer variable.
///
private System.ComponentModel.Container components = null;
public FrmChangeTime()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent
// call
//
}
///
/// Clean up any resources being used.
///
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
// Windows Form Designer generated code
///
/// The main entry point for the application.
///
[STAThread]
static void Main()
{
Application.Run( new FrmChangeTime() );
}
// adds two hours to the current time and shows the result
private void FrmChangeTime_Load(
object sender, System.EventArgs e )
{
DateTime dtmNow = DateTime.Now;
dtmNow.AddHours( 2 );
lblCurrentTime.Text = Convert.ToString( DateTime.Now );
lblTwoHours.Text = Convert.ToString( dtmNow );
} // end method FrmChangeTime_Load
} // end class FrmChangeTime
}
The complete correct code should read:
// ChangeTime.cs (Correct)
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace ChangeTime
{
///
/// Summary description for FrmChangeTime.
///
public class FrmChangeTime : System.Windows.Forms.Form
{
private System.Windows.Forms.Label lblTwoHours;
private System.Windows.Forms.Label lblCurrentTime;
private System.Windows.Forms.Label lblTwoHoursText;
private System.Windows.Forms.Label lblCurrentText;
///
/// Required designer variable.
///
private System.ComponentModel.Container components = null;
public FrmChangeTime()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent
// call
//
}
///
/// Clean up any resources being used.
///
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
// Windows Form Designer generated code
///
/// The main entry point for the application.
///
[STAThread]
static void Main()
{
Application.Run( new FrmChangeTime() );
}
// adds two hours to the current time and shows the result
private void FrmChangeTime_Load(
object sender, System.EventArgs e)
{
DateTime dtmNow = DateTime.Now;
lblCurrentTime.Text = Convert.ToString( DateTime.Now );
lblTwoHours.Text = Convert.ToString( dtmNow );
} // end method FrmChangeTime_Load
} // end class FrmChangeTime
}
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