c# - How to use DataTable AcceptChanges() method

Using DataTable AcceptChanges() Method
The DataTable class represents one table of in-memory data. The DataTable objects are conditionally case-sensitive. To create a DataTable programmatically the asp.net developers must first define its schema by adding DataColumn objects to the DataColumnCollection. To add rows to a DataTable, the developers must use the NewRow() method to return a new DataRow object at first. The DataTable also contains a collection of Constraint objects that can be used to ensure the integrity of the data.

The following asp.net c# tutorial code demonstrates how we use the DataTable class AcceptChanges() method in an asp.net web application.

The DataTable class AcceptChanges() method commits all the changes made to this table since the last time AcceptChanges() method was called. So the developers use the AcceptChanges() method to commit the changes they made on a DataTable instance.

When the asp.net web developers called the AcceptChanges() method then any DataRow object still in edit mode successfully ends its edits. The DataRowState also changes. All Added and Modified rows become Unchanged, and Deleted rows are removed.

The AcceptChanges() method is generally called on a DataTable after the asp.net web developers attempt to update the DataSet using the DbDataAdapter class Update() method.
DataTableAcceptChangesMethod.aspx

<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Data" %>

<!DOCTYPE html>
<script runat="server">
    void Button1_Click(object sender, System.EventArgs e)
    {
        DataTable dt = new DataTable();
        dt.TableName = "Products";

        DataColumn dc1 = new DataColumn();
        dc1.ColumnName = "ProductID";
        dc1.DataType = typeof(int);
        dc1.AllowDBNull = false;
        dc1.Unique = true;

        DataColumn dc2 = new DataColumn();
        dc2.ColumnName = "ProductName";
        dc2.DataType = typeof(string);

        DataColumn dc3 = new DataColumn();
        dc3.ColumnName = "Price";
        dc3.DataType = typeof(decimal);

        dt.Columns.AddRange(new DataColumn[] { dc1, dc2, dc3 });

        Label1.Text = "We make a blank table without any DataRow";
        GridView1.DataSource = dt;
        GridView1.DataBind();
        
        dt.Rows.Add(new object[] { 1, "digital camera", "225" });
        dt.Rows.Add(new object[] { 2, "calculator", "50" });

        //this line commits all the changes made to this table
        //since last time AcceptChanges() method was called
        dt.AcceptChanges();

        Label2.Text = "Now we insert some data and accept the changes";
        GridView2.DataSource = dt;
        GridView2.DataBind();

        Label3.Text = "Now we made some changes";
        //this ine update a row data
        dt.Rows[0]["ProductName"] = "television";
        //this ine update another one row data
        dt.Rows[1]["Price"] =75.25;

        GridView3.DataSource = dt;
        GridView3.DataBind();

        Label4.Text = "Now we reject the new changes";
        dt.RejectChanges();
        GridView4.DataSource = dt;
        GridView4.DataBind();
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to use DataTable AcceptChanges method in ado.net</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:DarkBlue; font-style:italic;">
            How to use DataTable AcceptChanges method in ado.net
        </h2>
        <hr width="550" align="left" color="CornFlowerBlue" />
        <asp:Label
             ID="Label1"
             runat="server"
             Font-Size="Large"
             ForeColor="CornflowerBlue"
             >
        </asp:Label>
        <asp:GridView 
            ID="GridView1"
            runat="server"
            BorderColor="Snow"
            ForeColor="Snow"
            Width="525"
            ShowHeaderWhenEmpty="true"
            >
            <HeaderStyle BackColor="IndianRed" />
            <RowStyle BackColor="DeepPink" />
            <AlternatingRowStyle BackColor="HotPink" />
        </asp:GridView>
        <br />
        <asp:Label
             ID="Label2"
             runat="server"
             Font-Size="Large"
             ForeColor="CornflowerBlue"
             >
        </asp:Label>
        <br />
        <asp:GridView 
            ID="GridView2"
            runat="server"
            BorderColor="Snow"
            ForeColor="Snow"
            Width="525"
            >
            <HeaderStyle BackColor="IndianRed" />
            <RowStyle BackColor="DeepPink" />
            <AlternatingRowStyle BackColor="HotPink" />
        </asp:GridView>
        <br />
        <asp:Label
             ID="Label3"
             runat="server"
             Font-Size="Large"
             ForeColor="CornflowerBlue"
             >
        </asp:Label>
        <br />
        <asp:GridView 
            ID="GridView3"
            runat="server"
            BorderColor="Snow"
            ForeColor="Snow"
            Width="525"
            >
            <HeaderStyle BackColor="IndianRed" />
            <RowStyle BackColor="DeepPink" />
            <AlternatingRowStyle BackColor="HotPink" />
        </asp:GridView>
        <br />
        <asp:Label
             ID="Label4"
             runat="server"
             Font-Size="Large"
             ForeColor="CornflowerBlue"
             >
        </asp:Label>
        <br />
        <asp:GridView 
            ID="GridView4"
            runat="server"
            BorderColor="Snow"
            ForeColor="Snow"
            Width="525"
            >
            <HeaderStyle BackColor="IndianRed" />
            <RowStyle BackColor="DeepPink" />
            <AlternatingRowStyle BackColor="HotPink" />
        </asp:GridView>
        <asp:Button 
            ID="Button1"
            runat="server"
            OnClick="Button1_Click"
            Text="Populate GridView"
            Height="45"
            Font-Bold="true"
            ForeColor="DarkBlue"
            />
    </div>
    </form>
</body>
</html>
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