I have written the code as below. here problem is that dt remain null. how to solve thst please tell me. public partial class Form1 : Form { private DataTable DTable; private DataRow drow; public Form1() { InitializeComponent(); } private OleDbConnection getConnection() { OleDbConnection con=new OleDbConnection (@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Documents and Settings\Administrator\My Documents\Visual Studio 2008\Projects\winApp for Student\winApp for Student\App_Data\SchooMgnSystem.mdb;Persist Security Info=True"); return con; } private void button1_Click(object sender, EventArgs e) { InsertData(); } private void InsertData() { if (DTable==null) { DTable = new DataTable(); DTable.Columns.Add("StudID", typeof(string)); DTable.Columns.Add("StudName", typeof (string)); DTable.Columns.Add("Address", typeof(string)); drow = DTable.NewRow(); drow[0] = txtStudID.Text; drow[1] = txtSTudName.Text; drow[2] = txtAddress.Text; DTable.Rows.Add(drow); grdStudent.DataSource = DTable; } else { drow = DTable.NewRow(); drow[0] = txtStudID.Text; drow[1] = txtSTudName.Text; drow[2] = txtAddress.Text; DTable.Rows.Add(drow); grdStudent.DataSource = DTable; } } private void button2_Click(object sender, EventArgs e) { string cmdstr; OleDbCommand cmd; OleDbConnection con = getConnection(); foreach (DataRow Drow in DTable.Rows) { cmdstr = "Insert into Student values('" + drow[0].ToString() + "','" + drow[1].ToString() + "','"+drow [2].ToString()+"')"; cmd = new OleDbCommand(cmdstr,con); try { con.Open(); cmd.ExecuteNonQuery(); } catch (Exception ex) { MessageBox.Show(ex.Message); } finally { con.Close(); } } }

2649

hi can any one tell me.... do we need to use color catridge also in HP Deskjet 630C series printer.... i have kept only black catridge but its not working.......

2234

ORA-26028: index string.string initially in unusable state

3863

when will we use lsmw , bdc and bapi? which will be easy to use and which is used for which type of data

2517

why we are using shift key in unix shell script

3167

wut is pre law

2720

who have build this website?

2274

2. A student studying Information Technology at Polytechnic of Namibia is examined by coursework and written examination. Both components of assessment carry a maximum of 50 marks. The following rules are used by examiners in order to pass or fail students. a. A student must score a total of 40% or more in order to pass (total = coursework marks + examination marks) b. A total mark of 39% is moderated to 40% c. Each component must be passed with a minimum mark of 20/50. If a student scores a total of 40% or more but does not achieve the minimum mark in either component he/she is given a technical fail of 39% (this mark is not moderated to 40%) d. Grades are awarded on marks that fall into the following categories. Mark 100-70 69-60 59-50 49-40 39-0 Grade A B C D E Write a program to input the marks for both components (coursework marks out of 50 and examination marks out of 50), out put the final mark and grade after any moderation. [30]

2880

what is new g/l functionality

2612

IMP-00000: Import terminated unsuccessfully Hi all . when i go to restore oracle dmp file in my database ans typing this command , C:UsersW>imp HR2011/HR2011@XE TABLES=* dmpfile=F:Share223.27.244.72EXP 2017-0113030008FU160710ZIP/FU160710.DMP this message was showed to me and restore mission filed . LRM-00101: unknown parameter name 'dmpfile' IMP-00022: failed to process parameters, type 'IMP HELP=Y' for help IMP-00000: Import terminated unsuccessfully how i can fix this problem plzzz

2939

ORA-26027: unique index string.string partition string initially in unusable state

6746

NZE-28890: Entrust Login Failed

1882

ORA-26032: index string.string loading aborted after string keys

2107

ORA-26076: cannot set or reset value after direct path structure is allocated

1969

ORA-26030: index string.string had string partitions made unusable due to:

1941