Difference between DataTable.Load() and DataTable = dataSet.Tables[];

I have a doubt i use the following piece of code get data from a SQLlite data base and Load it into a data table

SQLiteConnection cnn = new SQLiteConnection("Data Source=" + path);

cnn.Open();

SQLiteCommand mycommand = new SQLiteCommand(cnn);
string sql = "select Company,Phone,Email,Address,City,State,Zip,Country,Fax,Web from RecordsTable";
mycommand.CommandText = sql;

SQLiteDataReader reader = mycommand.ExecuteReader();

dt.Load(reader);

reader.Close();

cnn.Close();

In some cases when I try to load it Gives me "Failed to enable constraints exception"

But when I tried this below given piece of code for same table and same set of records it worked

SQLiteConnection ObjConnection = new SQLiteConnection("Data Source=" + path);

SQLite开发者_开发问答Command ObjCommand = new SQLiteCommand("select Company,Phone,Email,Address,City,State,Zip,Country,Fax,Web from RecordsTable", ObjConnection);
ObjCommand.CommandType = CommandType.Text;

SQLiteDataAdapter ObjDataAdapter = new SQLiteDataAdapter(ObjCommand);

DataSet dataSet = new DataSet();

ObjDataAdapter.Fill(dataSet, "RecordsTable");

dt = dataSet.Tables["RecordsTable"];

Can any one tell me what is the difference between two

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The Load() method purposefully evaluates constraints, whereas simply pulling out a DataTable from the Dataset by index does not. That's the difference of interest in your case.

See: http://msdn.microsoft.com/en-us/library/hsze9wte(VS.80).aspx