Edify Programming for C++ Programmers

To fasten user interaction,  expand the menu through a key event and then use a shortcut key to invoke menu command.  private void Form1_KeyDown(object sender, KeyEventArgs e)         {             if(e.KeyCode == Keys.Down)             helloToolStripMenuItem.ShowDropDown();         }

Here is the simple trick to get selected value in DataGridView in C# object value = dataGridView1.Rows[e.Cell.RowIndex].Cells[3].FormattedValue;  object value1 = dataGridView1.Rows[e.Cell.RowIndex].Cells[4].FormattedValue;  object GSTPercentage = dataGridView1.Rows[e.Cell.RowIndex].Cells[5].FormattedValue;    if (value == "" || value1 == "" || GSTPercentage == "")        return;   double result = Convert.ToDouble(value);   double result1 = Convert.ToDouble(value1);   double resultGST = Convert.ToDouble(GSTPercentage);    double NetValue = (result * result1) * resultGST;    dataGridView1.Rows[e.Cell.RowIndex].Cells[6].Value = Convert.ToString(NetValue);