it is being by another process when copy file

private void button11_Click_1(object sender, EventArgs e)
{

openFileDialog1.Title = "Insert an image ";
openFileDialog1.InitialDirectory = "c:";
openFileDialog1.FileName = "";
openFileDialog1.Filter = "JPEG Image|*.jpg|GIF Image|*.gif|PNG Image|*.png";
openFileDialog1.Multiselect = false;
if (openFileDialog1.ShowDialog() != DialogResult.OK)
return;     
pictureBox2.ImageLocation = openFileDialog1.FileName;
 }

private void button12_Click_4(object sender, EventArgs e)
{
const string new_dir = "\\\\192.168.1.5\\Personal Pictures";
MessageBox.Show(openFileDialog1.FileName);
string extension = System.IO.Path.GetExtension(openFileDialog1.FileName);
string renamed_name = textBox1.Text + "" + extension;
string fName = System.IO.Path.Combine(new_dir, renamed_name);
if (File.Exists(fName))
File.Delete(fName);this line give error
System.IO.File.Copy(openFileDialog1.FileName, fName);
string msg = string.Format("Copied {0} to {1}", openFileDialog1.FileName, fName);
MessageBox.Show(msg, this.Text, MessageBoxButtons.OK, MessageBoxIcon.Information);
}