C# Forms

C# > Forms

Contains classes for creating Windows-based applications using features available in the Microsoft Windows operating system.

• MessageBox
• PrintPreviewDialog

MessageBox C# Example

C# > Forms > MessageBox

Examples:

A. Displays a message box with specified text.

    MessageBox.Show("Text message");

B. Displays a message box with specified text, caption, and buttons.

string message = "Do you want to close this windows?";

string caption = "Question";

MessageBoxButtons buttons = MessageBoxButtons.YesNo;

DialogResult result = MessageBox.Show(message, caption, buttons);

if (result == System.Windows.Forms.DialogResult.Yes)

{

  this.Close();

}

AppActivate Visual Basic

VB.NET > Functions > AppActivate

Activates an application that is already running.

Example:
Start and activate notepad

AppActivate(Shell("C:\Windows\System32\notepad.exe", AppWinStyle.NormalFocus))

CurDir Visual Basic

VB.NET > Functions > CurDir 

Returns the current path.

Example:

MessageBox.Show(CurDir())

C# Random Color

C# > Color > Random

Random rnd = new Random();

Color randomColor = Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255));

Change DataGridView column to Hyperlink Runtime

C# > DataGridView > DataGridViewLinkCell

Example: Change DataGridView column to Hyperlink Runtime

foreach (DataGridViewRow r in dgv.Rows)

{

DataGridViewLinkCell lc = new DataGridViewLinkCell();

       lc.Value = r.Cells[1].Value;

       dgv[1, r.Index] = lc;

}

private void dgv_CellContentClick(object sender, DataGridViewCellEventArgs e)

{

if (e.RowIndex == -1)

              return;

if (dgv.Rows[e.RowIndex].Cells[e.ColumnIndex] is DataGridViewLinkCell)

       {

             string link = "http://www...";

             if(e.ColumnIndex == 1)

                System.Diagnostics.Process.Start(link  +                          dgv.Rows[e.RowIndex].Cells[4].Value as string);

       }

}

Read save data to Registry C# Example

C# > Win32 > RegistryKey 

RegistryKey represents a key-level node in the Windows registry

Example:

Save user name to registry

RegistryKey regKey = Microsoft.Win32.Registry.CurrentUser.OpenSubKey("MyProgram");

if (regKey == null)

  regKey = Microsoft.Win32.Registry.CurrentUser.CreateSubKey("MyProgram");

if (regKey.GetValue("User", "") == null)

{

  regKey.SetValue("User", txtUser.Text);

}

else

{

  if (txtUser.Text != regKey.GetValue("User", "").ToString())

  {

    regKey.SetValue("User", txtUser.Text);

  }

}

regKey.Close();