C#

Control active = ActiveControl; // called from within your Form
Control next = active.GetNextControl(active, false); // search backward*
next.Focus();
active.Focus();

public void ValidateFocusedControl()
{
    foreach(Control ctl in Controls)
        if(ValidateFocusedControlRecursive(ctl))
            break;
}

bool ValidateFocusedControlRecursive(Control ctl)
{
    if(ctl.Focused)
    {
        if(ctl.CausesValidation)
        {
            // Make current focused control lose focus, and then get
            // it back, so we can force its validation
            TextBox txtBox = new TextBox();
            txtBox.Bounds = new Rectangle(-100, -100, 1, 1);
            txtBox.Parent = ctl.Parent;
            txtBox.Focus();
            ctl.Focus();
            txtBox.Parent = null;
            txtBox.Dispose();
        }
        return true;
    }

    foreach(Control ctl2 in ctl.Controls)
        if(ValidateFocusedControlRecursive(ctl2))
            return true;

    return false;
}

String s = "Lorem ipsum dolor sit amet, kec=123abc";<br />
int index = s.IndexOf("kec=");

<br />
 //this means that u draw 10 points since u start from zero<br />
 for (index1=0; index1<10; index1++)<br />
 {<br />
  ptf[index1] =new PointF(105 + 28,250); //PointF(X,Y)<br />
 }<br />
}<br />
//to joint the line on the point<br />
myGraphics.DrawLine(myPen, ptf[drawLineIndex1], ptf[drawLineIndex1+1]);

for (index1=0; index1<10; index1++)<br />
{<br />
ptf[index1] =new PointF(105,(-375/maxValue)* -2.3);<br />
//maxValue is the higest value that i wanna plot<br />
//in this case, -2.3 is the minimum value<br />
}