Answer / saef-allah

Struggled with this one for 2 days and went through tons of
forums till I found this one:

http://social.msdn.microsoft.com/Forums/en-
US/sqlsetupandupgrade/thread/84b399b5-7d7b-46fa-8f86-
8c9af2cbf641

SokSa.Icy had the right idea.

My particular problem also involved going through the
registry to remove all instances of Visual Studio 2008 as
well as a .Net 3.5 hotfix that I could not get rid of.

Once I uninstalled and did everything this guy did, I also
went through the registry and searched/deleted all
instances of the framework hotfix to get it out of the
add / remove dialog box in control panel.

I also used wise registry cleaner to make sure I got all
inconsistencies out of the way, rebooted, and
installed .net 2.0 Express.

After a successful installation, I rebooted again and ran
sql server 2005 express installation and presto - back in
business...

God Bless the user forums on the Net - Microsoft would have
made a bundle off us by now in tech support fees...

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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(); } } }

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