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drawing a red border on or around a control in winforms

Posted on 2014-12-15

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Last Modified: 2014-12-15

I want to highlight the controls that need to be filled in when a user does not enter information - for example a red border - how can I achieve this in a win form?

 string msg = "";
                    if (comBoxToLocations.SelectedValue.ToString() != "-1" && comBoxToLocations.SelectedValue.ToString() != "3")
                    {
                        ToID = Convert.ToInt32(comBoxToLocations.SelectedValue.ToString());
                    }
                    else
                    {
                        if (comBoxToLocations.SelectedValue.ToString() == "-1")
                        {
                            msg += "You must select a location to send to\r\n";
                        }
                        if (comBoxToLocations.SelectedValue.ToString() == "3")
                        {
                            msg += "Location cannot be Unknown\r\n";
                        }
                    }
                    if (cmboCarrier.SelectedValue.ToString() != "-1")
                    {
                        carrierID = Convert.ToInt32(cmboCarrier.SelectedValue.ToString());
                    }
                    else
                    {
                        msg += "You must select a carrier\r\n";
                    }
                    if (string.IsNullOrEmpty(trackingNumber))
                    {
                        msg += "You must enter a tracking number\r\n";
                    }
                    if (expecteddate == today)
                    {
                        msg += "Your Expected arrival date is too short\r\n";
                    }
                    if (msg != "")
                    {
                        MessageBox.Show(msg);
                        return;
                    }

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Question by:r3nder

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4 Comments

LVL 86

Expert Comment

by:Mike Tomlinson

ID: 405011252014-12-15

Have you considered using the standard ErrorProvider control? Very easy to use...
http://msdn.microsoft.com/en-us/library/aa983609(v=vs.71).aspx

You can set an initial error with:

errorProvider1.SetError(comboBox1, "Please select a value!");

And clear it with:

errorProvider1.SetError(comboBox1, "");

LVL 1

Accepted Solution

by:psdesignadmin

psdesignadmin earned 500 total points

ID: 405011322014-12-15

Most of the Winform controls have a property BorderStyle that allows for a border to be shown around that control. But the look and feel of that border cannot be changed. And there are controls (button, groupbox, etc.) that do not have this property. So there is no direct way of adding a Border around these controls

The following magic lines allow us to add a border around a control:

public class MyGroupBox : GroupBox
{
   protected override void OnPaint(PaintEventArgs e)
   {
     base.OnPaint(e);
     ControlPaint.DrawBorder(e.Graphics, ClientRectangle,
                                  Color.Red, BORDER_SIZE, ButtonBorderStyle.Inset,
                                  Color.Red, BORDER_SIZE, ButtonBorderStyle.Inset,
                                  Color.Red, BORDER_SIZE, ButtonBorderStyle.Inset,
                                  Color.Red, BORDER_SIZE, ButtonBorderStyle.Inset);
   } 
}

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The ControlPaint class allows to add a border around a control. The above call can be invoked in a Paint event handler of a control.

~Tim

LVL 6

Author Closing Comment

by:r3nder

ID: 405011552014-12-15

Thanks Tim

LVL 1

Expert Comment

by:psdesignadmin

ID: 405011622014-12-15

Glad it helps!

~Tim

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