Question

I am making a program which needs to add the value of all numericUpDowns, and display it on the label.

numericUpDowns are created programatically and added to ArrayList.

ArrayList numericUpDownMy = new ArrayList();
     numericUpDownMy.Add(new NumericUpDown());
        System.Drawing.Point h = new System.Drawing.Point(120, 275+ i * 19);          
        (numericUpDownMy[i] as NumericUpDown).Location = h;
        (numericUpDownMy[i] as NumericUpDown).Size = new System.Drawing.Size(50, 20);
        this.Controls.Add(numericUpDownMy[i] as NumericUpDown);
         int total = (((int)numericUpDown[0]) + ((int)numericUpDown[1]) + ((int)numericUpDown[2]) + ((int)numericUpDown[3]));
    labelScore.Text = total.ToString();

Obviously this doesn’t work as I don’t get the actual value of NumericUpDown. Any advice would be appreciated.

Answer 1

change this line :

  decimal total = (numericUpDownMy[1] as NumericUpDown).Value + 
                  (numericUpDownMy[2] as NumericUpDown).Value + 
                  (numericUpDownMy[3] as NumericUpDown).Value;

and besides that don’t use ArrayList, use List<NumericUpDown>, to get rid of all that casting or add to collection at the end. I would wrote that code in this way :

  List<NumericUpDown> numUpDnList = new List<NumericUpDown>();
  for (int i = 0; i < 3; i++)
  {
    NumericUpDown numUpDn = new NumericUpDown();
    numUpDn.Location = new System.Drawing.Point(120, 275 + i * 19);
    numUpDn.Size = new System.Drawing.Size(50, 20);
    this.Controls.Add(numUpDn);
    numUpDnList.Add(numUpDn);
  }
  decimal total = numUpDnList.Sum(updn => updn.Value);
  labelScore.Text = total.ToString();