insert the selected image from gridview into mysql

I want to insert selected image from gridview into mysql table. When I try to, it gives me message saying
"An exception of type 'System.InvalidCastException' occurred in App_Web_zptg3ta3.dll but was not handled in user code.
Additional information: Unable to cast object of type 'System.Int32' to type 'System.Data.DataRow'."

Below is my code:
if (gvImages.SelectedIndex != -1)
        {
            DataRow SelectedRowValue = ((DataRow)gvImages.SelectedValue);
            
            byte[] ImageBytes = (byte[])SelectedRowValue.ItemArray[1];
            MySqlCommand cmd2 = new MySqlCommand("INSERT INTO rasmlar (Rasm) VALUES (@ImageSource)", con);
            cmd2.Parameters.Add("@ImageSource", MySqlDbType.Blob, ImageBytes.Length).Value = ImageBytes;
            cmd2.ExecuteNonQuery();
        }