how to check image property in C#

krrazyumesh wrote:

if any one try to change the extension of txt file or exe file into jpeg and upload it, then it will throw an exception "error"

I would rely on file name. If you got this exception, just show it to the user.

The possible user's action of renaming *.txt to *.jpg would be stupid enough to dub it "exceptional". It does not mean you should not be prepared to it. You should ultimately handle all exceptions, but this one should not be a special case. Handle it with all other exceptions at once.

—SA

Hi,
I have made a simple Work out for you.

Place a Button and Pictuerbox on you winform.button1,pictureBox1

In Button click open the jpg file and load it in pictuer box. I have used try catch if the selected file is valid jpeg then display in pictuer box .if other file like texct or exe file extention change as jpg and upload display the error message from exceptaiton part.
see the buttonclikc code here for details.

private void button1_Click(object sender, EventArgs e)
      {
          string filename = "";
          OpenFileDialog open = new OpenFileDialog() { Filter = "Image Files|*.JPG;*.JPEG;" };
          if (open.ShowDialog() == DialogResult.OK)
          {
              filename = open.FileName;
          }
          if (filename != "")
          {
              string image = filename;
              try
              {
                  Bitmap bmp = new Bitmap(image);


              pictureBox1.Image = bmp;//add this line
              FileStream fs = new FileStream(image, FileMode.Open, FileAccess.Read);
              byte[] bimage = new byte[fs.Length];
              fs.Read(bimage, 0, Convert.ToInt32(fs.Length));
              fs.Close();
              byte[] Photo = bimage;
                  }
               catch (Exception ex)
              {
                  MessageBox.Show("Select the valid file");
              }

          }
      }