C# not understanding why this code isn't working

Question

1.00/5 (1 vote)

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This is my code

C#

private void timer1_Tick(object sender, EventArgs e)
     {
pictureBox1.Location = new Point(pictureBox1.Location.X += 1, pictureBox1.Location.Y);
     }

and this is my error

VB

Error   1   Cannot modify the return value of 'System.Windows.Forms.Control.Location' because it is not a variable  Z:\Longitudinal Studio\Longitudinal Studio\Form1.cs 73  47  Longitudinal Studio

Posted 11-Apr-12 20:30pm

C.CoderCreator

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2 solutions

Solution 1

"Because the Point class is a value type (Structure in Visual Basic, struct in Visual C#), it is returned by value, meaning accessing the property returns a copy of the upper-left point of the control. So, adjusting the X or Y properties of the Point returned from this property will not affect the Left, Right, Top, or Bottom property values of the control. To adjust these properties set each property value individually, or set the Location property with a new Point."

Source :
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.location.aspx[^]

So this is trouble statement

pictureBox1.Location.X += 1

Posted 11-Apr-12 20:37pm

Lakamraju Raghuram

Comments

Suresh Suthar 12-Apr-12 2:41am

You beat me to it. Nice answer. 5!

Lakamraju Raghuram 12-Apr-12 2:43am

Team work
Thank you Suresh.

VJ Reddy 12-Apr-12 3:02am

Good answer. +5

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VJ Reddy · Accepted Answer · 2012-04-11T21:06:00

The solution 1 given by Lakamraju Raghuram is very good answer and straight to the point.
I want to add that, even if pictureBox1.Location.X can be modified, it is redundant in the following statement as the same value is again passed as an argument to the parameter of the constructor, which will be set in the constructor again.

C#

pictureBox1.Location = new Point(pictureBox1.Location.X += 1, pictureBox1.Location.Y);

So,
pictureBox1.Location.X + 1 will be sufficient instead of
pictureBox1.Location.X += 1