Image in crystal report

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CrystalReports

I have a crystal report created in vb.net 2010. It displays images at runtime using image path stored in db table.
Certain images do not display at all even though file is present at the path,
whereas certain images do display properly.

can anybody tell me what could be the problem?

Following is the code that i have used to generate the image from img path stored in db.

private void Form1_Load(object sender, EventArgs e)
        {
            this.Text = DisplayHeaderText;
            SqlConnection cn = new SqlConnection("Data Source=" + RptServer + ";Initial Catalog=" + RptDatabase + ";user=" + RptUser + ";Password=" + RptPassword);
            SqlCommand Cmd = new SqlCommand();
            SqlDataAdapter myAdapter = new SqlDataAdapter();

            Cmd.CommandText = " Select * From vw_SalesWithImage";
            Cmd.Connection = cn;

            myAdapter.SelectCommand = Cmd;

            cn.Open();
            DataSet ds = new DataSet();
            myAdapter.Fill(ds);
            cn.Close();

            DataTable dttmp = ds.Tables[0];

            dttmp.Columns.Add("IsImage", System.Type.GetType("System.Byte[]"));

            for (int index = 0; index < ds.Tables[0].Rows.Count; index++)
            {
                if (dttmp.Rows[index]["ImgFile"].ToString() != "")
                {
                    string s = dttmp.Rows[index]["ImgFile"].ToString();
                    LoadImage(dttmp.Rows[index], s);
                }
                else
                {
                    LoadImage(dttmp.Rows[index], "");
                }
            }

            // Finally display report in crystal report viewer
            ReportDocument crDoc = new CrystalDecisions.CrystalReports.Engine.ReportDocument();
            string rptPath = Application.StartupPath;
            crDoc.Load(rptPath + "\\SalesWithImage.rpt");
            crDoc.SetDataSource(dttmp);
            crptViewer.ReportSource = crDoc;
            crDoc.DataDefinition.FormulaFields[0].Text = "'" + FltrHeaderText + "'";
        }




 private void LoadImage(DataRow objDataRow, string FilePath)
        {
            if (FilePath == "")
            {
                return;
            }

            if (File.Exists( FilePath))
            {
                FileStream fs = new FileStream(FilePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
                //byte[] Image = new byte[fs.Length];
                //fs.Read(Image, 0, Convert.ToInt32(fs.Length));
                
                BinaryReader br = new BinaryReader(fs); 
                byte[] imgbyte = new byte[fs.Length + 1]; 
                imgbyte = br.ReadBytes(Convert.ToInt32((fs.Length)));
                fs.Close();

                objDataRow["IsImage"] = imgbyte;
            }
        }