How Can I Insert Picture In Datatbase?

 bool CheckFileType(string fileName)
    {
        string ext = Path.GetExtension(fileName);
        switch (ext.ToLower())
        {
            case ".gif":
                return true;
            case ".jpg":
                return true;
            case ".jpeg":
                return true;
            case ".png":
                return true;
            case ".bmp":
                return true;
            default:
                return false;

        }
    }


protected void btnUpload_Click(object sender, EventArgs e)
    {
        if (fileupload.HasFile)
        {
            if (fileupload.PostedFile.ContentLength < 50000)
            {
                
                if (CheckFileType(fileupload.FileName))
                {

                    String filepath = "FolderName/" + fileupload.FileName;
                    fileupload.SaveAs(MapPath(filepath));

                    qry = "update emp_detail set img='" + filepath.ToString() + "' where emp_id='" + Session["emp_id"].ToString() + "' ";
                    conn.Open();
                    SqlCommand cmd = new SqlCommand(qry, conn);
                    cmd.ExecuteNonQuery();
                    conn.Close();
                }
                else
                {
                    lblmsg.Text = "Only jpg, jpeg, png, gif & bmp Images are Allowed";
                }
            }
            else
            {
                lblmsg.Text = "File size Exceed limit 100KB";
            }
        }
    }