sql server 2008 - how to verify DPFP finger print from MS SQL in C# -


i have saved dpfp template in varbinary(max), retireivng database , converting in byte[] deserilizing it, , putting in verify() method, error occcruing exception hresult: 0xfffffff8

how getting data given below

sqlconnection cn = new sqlconnection(@"data source=windows\me;initial catalog=enroll;persist security info=true;user id=sa ;  password=sa123");  cn.open(); sqldataadapter adp = new sqldataadapter("select varb employee employeeid='127'", cn); datatable dt = new datatable(); adp.fill(dt); bytes= convertdatasettobytearray(dt);  template = new dpfp.template(); template.deserialize(bytes);  <b>verificator.verify(features, template, ref result);</b> updatestatus(result.farachieved);  if (result.verified)     makereport("the fingerprint verified."); else     makereport("the fingerprint not verified.");

this verify() not verifying data coming db>

where doing mistake? in conversion? or in not getting data properly?

convertdatasettobytearray() method should excluded system.byte in datable convert in byte[] by:

foreach (datarow row in dt.rows) {     bytes = (byte[])row["varb"]; }

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