dataTable

Question

I've created a table Jobs in the page load. When the user clicks a button on the page then method confirm() is called. Each time this button is hit I want to add another record to my Jobs table so that it keeps increasing in size during the session: DataSet dsJobs = new DataSet(); DataTable jobs = new DataTable("Jobs"); private void Page_Load(object sender, System.EventArgs e) { if (!IsPostBack) { jobs.Columns.Add(new DataColumn("Name",typeof(string))); jobs.Columns.Add(new DataColumn("Surname",typeof(string))); } public void confirm() { DataRow rowJob = dsJobs.Tables["Jobs"].Rows.Add(new object [] {"jack","london"}); dsJobs.Tables.Add(jobs); dgJobs.DataSource = ds; Page.DataBind(); } When I run this however and click on the Confirm button then I get error that Object reference not set to an instance of an object. for line DataRow rowJob = .........etc as above Thanks for any help you can give on this.