WinForms - Using Mutex to force only one instance of Form

   1: static class Program

   2:  {

   3:      ///<summary>

   4:      /// The main entry point for the application.

   5:      ///</summary>

   6:      [STAThread]

   7:      static void Main()

   8:      {

   9:          bool instanceCountOne = false;

  10:  

  11:          using (Mutex mtex = new Mutex(true, "MyRunningApp", out instanceCountOne))

  12:          {

  13:              if (instanceCountOne)

  14:              {

  15:                  Application.EnableVisualStyles();

  16:                  Application.SetCompatibleTextRenderingDefault(false);

  17:                  Application.Run(new Form1());

  18:                  mtex.ReleaseMutex();

  19:              }

  20:              else

  21:              {

  22:                  MessageBox.Show("An application instance is already running");

  23:              }

  24:          }

  25:      }

  26:  }

Windows Forms Application Version Numbers

 

Link

Tips for working with WinForms DataGridView

Link

Default Form Button

Form properties ->Misc->AcceptButton

XML Data Manipulation in C# Using DataSet Class

XML Data Manipulation in C# Using DataSet Class

DataGridView - Copy multiple cells to clipboard

How to: Enable Users to Copy Multiple Cells to the Clipboard from the Windows Forms DataGridView Control

DataGridView Column Header Style

In order to use styles in your DataGridView control for your .NET 2.0 Windows application, you must specify dgvMyDataGridView.EnableHeadersVisualStyles = false.
Example of the code:

//Instantiate new DataGridViewCellStyle
System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle2 =
    new System.Windows.Forms.DataGridViewCellStyle();

//Define Header Style
dataGridViewCellStyle2.Alignment =
    System.Windows.Forms.DataGridViewContentAlignment.BottomCenter;
dataGridViewCellStyle2.BackColor = System.Drawing.Color.Navy;
dataGridViewCellStyle2.Font = new System.Drawing.Font("Microsoft Sans Serif",
    8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
dataGridViewCellStyle2.ForeColor = System.Drawing.Color.White;
dataGridViewCellStyle2.SelectionBackColor =
    System.Drawing.SystemColors.Highlight;
dataGridViewCellStyle2.SelectionForeColor = System.Drawing.Color.Navy;
dataGridViewCellStyle2.WrapMode =
    System.Windows.Forms.DataGridViewTriState.True;

//Apply Header Style
this.dgvTransactions.ColumnHeadersDefaultCellStyle =
    dataGridViewCellStyle2;

//Disable Headers Visual Styles - apparently there is an "automatic"
// visual style that needs to be disabled
this.dgvTransactions.EnableHeadersVisualStyles = false;

Cell Styles in the Windows Forms DataGridView Control

Source

DataGridView - Conditional Color Change

If DataGridView.Rows(i).Cells("locuscount").Value = "0" Then
          DataGridView.Rows(i).Cells("Status").Style.BackColor() = Color.AliceBlue
End If

DataGridView - Click Location & Selected Col/Row

 

For selected column and row:

private void myDataGridView_MouseDown(object sender, MouseEventArgs e)

{

    int ColumnIndex =myDataGridView.SelectedColumns[0].Index;  // Selected Column Index

    int RowIndex = myDataGridView.SelectedRows[0].Index;  // Selected Row Index

}

 

 

For click location use:

DataGridView.HitTestInfo Class

 

DataGridView.HitTestInfo myHit = dataGridView1.HitTest(e.X, e.Y);

if (myHit.Type == DataGridViewHitTestType.Cell)

{

    // select row == myHit.RowIndex;

}