Hi sriya,

i beleive that you need to create a DataRow to add a new ROW as shown below
VB Code:
  1. Dim dtcmp As DataRow = m_dt_test.NewRow
  2.             dtcmp("CompanyName") = txtCompany.Text
  3.             'etc
  4.             'etc
  5.             m_dt_test.Rows.Add(dtcmp)
  6.             m_DataAdapter.Update(m_dt_test)

second this line "in ur code" has an error, there is . before m_dt_test

"m_dataAdapter_test.Update(.m_dt_test)" it shows the following error.

hope this helps...

Regards,