Store and retrieve data table into Varbinary column - sql-server

Question

For some reason I had to store a DataTable variable in a Varbinary column of a SQL Server table, but I get errors.
This is store code:
// Read DataTable to Byte array
DataTable dtgrd = new DataTable();
DataAccess ds = new DataAccess();
DataSet dst = new DataSet();
dst.Tables.Add(dtgrd);
string xmlString = dst.GetXml();
MemoryStream ms = new MemoryStream();
XmlDocument xml = new XmlDocument();
xml.LoadXml(xmlString);
xml.Save(ms);
byte[] xmlBytes = ms.ToArray();
// Store DataTable into database
SqlConnection CN = new SqlConnection(Global.cs);
string str = #"INSERT INTO...... ";
SqlCommand SqlCom = new SqlCommand(str, CN);
SqlCom.Parameters.Add(new SqlParameter("#FKDocInReqID", FKDocInReqID));
SqlCom.Parameters.Add(new SqlParameter("#value", (object)xmlBytes));
SqlCom.Parameters.Add(new SqlParameter("#Data", ReportTitle));
SqlCom.Parameters.Add(new SqlParameter("#DocUploadUser_secuserID", Global.S_UserID));
CN.Open();
decimal id =(decimal) SqlCom.ExecuteScalar();
CN.Close();
The store code has worked correctly and in the database, the columns has the proper bytes.
But the retrieve code does not work:
string s = #"select * from .... where id={0} ";
s = string.Format(s, id);
DataTable dt = new DataTable();
dt = ds.doSelect(s);
using (System.IO.MemoryStream memStream1 = new System.IO.MemoryStream((byte[])dt.Rows[0]["Value"]))
{
dataGridView1.DataSource = FromBytes(memStream1.ToArray());
dataGridView1.Refresh();
dataGridView1.Show();
}
and
static DataTable FromBytes(byte[] arr)
{
using (var ms = new MemoryStream(arr))
{
return (DataTable)new BinaryFormatter().Deserialize(ms);//**ERROR Raised Here**
}
}
static byte[] ToBytes(DataTable table)
{
using (var ms = new MemoryStream())
{
table.RemotingFormat = SerializationFormat.Binary;
new BinaryFormatter().Serialize(ms, table);
return ms.ToArray();
}
}
this error is raised:
error message

Answer 1

The example code on Microsoft's website uses XmlTextReader
static DataTable FromBytes(Stream st)
{
var ds = new DataSet();
using (XmlTextReader xmlReader = new XmlTextReader(st))
{
ds.ReadXml(xmlReader);
}
return ds.Tables[0];
}
I'll leave you to think about the obvious design flaws in storing one table within another.

Answer 2

this is how I figure out this problem maybe help to someone else.
instead of save data into Varbinary field save it to xml in nvarchar(max) and then retrieve it :
//Retrieve Process:
string s = #"select * from .... where id={0} ";
s = string.Format(s, ID);
DataTable dtlist = new DataTable();
DataAccess ds = new DataAccess();
dtlist = ds.doSelect(s);//doselect is function that run select sql command
XmlDocument xml = new XmlDocument();
xml.LoadXml(dtlist.Rows[0]["Data"].ToString());//data is column name that store xml in it
StringReader theReader = new StringReader(xml.InnerXml);
DataSet theDataSet = new DataSet();
theDataSet.ReadXml(theReader);
gridEX1.DataSource = theDataSet.Tables[0];