OpenFileDialog1. showdialog();

// assign the name to a text box
nameTextbox.text = Openfiledialog1.FileName;

// store the image in a picture box
pictureBox1.Image = Image.FromFile(nameTextbox.Text);

//creae a fileinfo object
FileInfo imageinfo = new FileInfo(nameTextbox.Text);

//use Length method to get length and show it in a textBox.
sizeTextbox.Text = imageinfo.Length.toString();