📄 remove-delete-rows.aspx
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<%@Page Language="C#"%>
<%@Import Namespace="System.Data" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<title>Removing versus Deleting Rows in a DataTable</title>
<!-- #include file="..\global\style.inc" -->
</head>
<body bgcolor="#ffffff">
<span class="heading">Removing versus Deleting Rows in a DataTable</span><hr />
<!--------------------------------------------------------------------------->
<b>The original table contents</b>:
<asp:datagrid id="dgrResult1" runat="server" /><br />
<b>The table contents after Rows(1).Delete()</b>:
<asp:datagrid id="dgrResult2" runat="server" /><br />
<b>The table contents after RejectChanges()</b>:
<asp:datagrid id="dgrResult3" runat="server" /><br />
<b>The table contents after Rows.Remove(1)</b>:
<asp:datagrid id="dgrResult4" runat="server" /><br />
<b>The table contents after RejectChanges()</b>:
<asp:datagrid id="dgrResult5" runat="server" /><br />
<script language="C#" runat="server">
void Page_Load(Object sender, EventArgs e)
{
// create a new empty Table object
DataTable objTable = new DataTable("newTable");
// define four columns (fields) within the table
objTable.Columns.Add("ISBN", Type.GetType("System.String"));
objTable.Columns.Add("Title", Type.GetType("System.String"));
objTable.Columns.Add("PublicationDate", Type.GetType("System.DateTime"));
objTable.Columns.Add("Quantity", Type.GetType("System.Int32"));
// declare a variable to hold a DataRow object
DataRow objDataRow;
// create a new DataRow object instance in this table
objDataRow = objTable.NewRow();
// and fill in the values
objDataRow["ISBN"] = "1234567800";
objDataRow["Title"] = "Professional Video Recorder Programming";
objDataRow["PublicationDate"] = new DateTime(2001, 3, 1);
objDataRow["Quantity"] = "3956";
objTable.Rows.Add(objDataRow);
// repeat to add two more rows
objDataRow = objTable.NewRow();
objDataRow["ISBN"] = "1234567801";
objDataRow["Title"] = "Professional WAP Phone Programming";
objDataRow["PublicationDate"] = new DateTime(2201, 6, 1);
objDataRow["Quantity"] = "29";
objTable.Rows.Add(objDataRow);
objDataRow = objTable.NewRow();
objDataRow["ISBN"] = "1234567802";
objDataRow["Title"] = "Professional Radio Station Programming";
objDataRow["PublicationDate"] = new DateTime(2001, 4, 1);
objDataRow["Quantity"] = "10456";
objTable.Rows.Add(objDataRow);
// call AcceptChanges to accept the changes to the table so far
objTable.AcceptChanges();
// assign the DataTable's DefaultView object to the DataGrid control
dgrResult1.DataSource = objTable.DefaultView;
dgrResult1.DataBind(); // and bind (display) the data
// now Delete the second row and display the contents again
objTable.Rows[1].Delete();
dgrResult2.DataSource = objTable.DefaultView;
dgrResult2.DataBind();
// call RejectChanges to restore the deleted row
objTable.RejectChanges();
dgrResult3.DataSource = objTable.DefaultView;
dgrResult3.DataBind();
// now Remove the second row from the table
// note that this is a method of the Rows collection not the Row object
objTable.Rows.RemoveAt(1);
dgrResult4.DataSource = objTable.DefaultView;
dgrResult4.DataBind();
// call RejectChanges - the deleted row is not restored
objTable.RejectChanges();
dgrResult5.DataSource = objTable.DefaultView;
dgrResult5.DataBind();
}
</script>
<!--------------------------------------------------------------------------->
<!-- #include file="..\global\foot.inc" -->
</body>
</html>
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