c#.Object reference not set to an instance of an object.

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i have to compare height and width of two images i am geeting height and width of first images as follow :

C#

public int imageWidth()
        {




            {

                int w=0;
                w = pictureBox1.Image.Width;
                return w;

            }
        }
        public int imageheight()
        {
            int h=0;
           h = pictureBox1.Image.Height;
            return h;

        }

and in secode class i am using.
CreateSheet cs = new CreateSheet();
if (bmp.Width != cs.imageWidth() && bmp.Height != cs.imageheight())
{
MessageBox.Show("width and height of both images are not equal");
ImageResize(bmp,cs.imageWidth(),cs.imageheight());

}
but geeting exception
Object reference not set to an instance of an object. at line :

C#

w = pictureBox1.Image.Width; how it can be solved??

             return w;

Posted 22-Apr-13 20:23pm

irfanniazi

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Bernhard Hiller · Answer 1 · 2013-04-22T20:31:00

Solution 1

What about no Image loaded in the PictureBox? I.e. pictureBox1.Image is null, and consequently you cannot acces its width property.
By the way, you do not need to load an image into a PictureBox to get its size. The Image and Bitmap classes have these properties too.

Posted 22-Apr-13 20:31pm

Bernhard Hiller

Comments

irfanniazi 23-Apr-13 2:34am

so i should have pictureBox1.Image!=null before that line??

Nilesh Rokade 26-Apr-13 9:14am

Still have problem ?

Nilesh Rokade · Answer 2 · 2013-04-22T21:31:00

Yes check Null before using also in order to avoid exception you can also put not null check on image you are assigning to Picture Box

public int imageWidth()
{
{

int w=0;
if(pictureBox1&&pictureBox1.Image)
w = pictureBox1.Image.Width;
return w;

}
}
public int imageheight()
{
int h=0;
if(pictureBox1&&pictureBox1.Image)
h = pictureBox1.Image.Height;
return h;

}