Answer / surjit

Typed vs. Untyped Datasets
A DataSet can be Typed or Untyped. The difference between
the two lies in the fact that a Typed DataSet has a schema
and an Untyped DataSet does not have one. It should be
noted that the Typed Datasets have more support in Visual
studio.

Answer / parvez borkar

Typed Dataset provide compile time type checking. Also it
provides the names of the Columns of the types we are using
for that typed data set. This is something we dont get in
the normal datasets.

Answer / kiranmadiraju

We can generate Typed Dataset based on a single table or
multiple tables which are related by using primary key and
foreign key relationships through visual stdio which
generates a xsd file. This is a strongly typed in-memory
cache of data.
Untyped dataset is one which is filled/generated using a
DataAdapter and a command object.

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OleDbDataAdapter ole=new OleDbDataAdapter(new OleDbCommand ("select * from login",oleDbConnection1)); OleDbCommandBuilder cmd=new OleDbCommandBuilder(ole); ole.Fill(dataSet11,"login"); DataRow drow=dataSet11.Tables ["login"].NewRow(); drow[0]=textBox1.Text; drow[1]=textBox2.Text; drow[2]=textBox3.Text; dataSet11.Tables["login"].Rows.Add (drow); ole.UpdateCommand=cmd.GetUpdateCommand(); ole.Update(dataSet11,"login"); MessageBox.Show("one row added"); this gives exception.how to solve it

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