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HttpUtility.UrlEncode(str.ToString(), System.Text.Encoding.UTF8)
DataRow dr = ds.Tables["temp_pic"].Rows[0];
byte[] buffer = (byte[])dr["imagedata1"];
//string base64Str = Convert.ToBase64String(bytes);
//byte[] buffer = Convert.FromBase64String(base64Str);
MemoryStream ms2 = new MemoryStream(buffer, 0, buffer.Length);
ms2.Seek(0, SeekOrigin.Begin);
Image image2 = Image.FromStream(ms2);
pictureBox1.Image = image2;