Parameter is not valid. Getting image from database into picture box

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C#

SQL

SQL-Server-2012

This is my code for inserting image from picturebox into database.
Image img = this.pictureBox1.Image;
byte[] arr;
ImageConverter converter = new ImageConverter();
arr = (byte[])converter.ConvertTo(img, typeof(byte[]));
I then insert arr into the database.

This is the code I use to select the image from database into a picturebox. But it gives me an error"Parameter is not valid."

string query = "SELECT * FROM Drug WHERE DrugCode = '" + this.DataGridView1.CurrentRow.Cells[0].Value + "'";
SqlCommand cmd = new SqlCommand(query, Conet.con);
SqlDataReader row = cmd.ExecuteReader();

Form_EditDrug newMDIChild = new Form_EditDrug(this.txtStaff.Text);
newMDIChild.TopMost = true;
newMDIChild.BringToFront();
if (row.Read())
{
byte[] data = (byte[])row["Picture"];
MemoryStream ms = new MemoryStream(data);

newMDIChild.pictureBox1.Image = Image.FromStream(ms);
}

Help please.