Code is...
SqlConnection con = new SqlConnection();
con.ConnectionString = "data source=NDTS12; initial Catalog=ndts_tm247; integrated security=true;";
con.Open();
string sql = "INSERT INTO " + txtemployeeid.Text.Trim() + "values('" + txtname.Text + "','" + txtcont.Text + "','" + txtcont2.Text + "','" + txtaddress.Text + "','" + txtmail.Text + "','" + txtsaletype.Text + "','" + txtamount.Text + "','" + dateTimePicker1.Text + "','" + txtissue.Text + "','" + txtstatus.Text + "','" + txttechname.Text + "','" + txtos.Text + "','" + txttvid.Text + "','" + txttvpw + "','" + txtdiscription.Text + "' )"; sql += ")";
SqlCommand cmd = new SqlCommand(sql, con);
cmd.ExecuteNonQuery();
con.Close();