DetailsView Control in ASP.NET - Part 9


Introduction

In Part 8 of this article series we have discussed how to Insert Data with DetailsView Control. Now in this article we will discuss how Delete Data with DetailsView Control.


Deleting Data with DetailsView Control

We can delete records with the DetailsView control by enabling its AutoGenerateDeleteButton property. The page given below enables us to both insert and delete records in the Movies database table. Take a look here.



<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
   
    <asp:DetailsView
        id="dtlBooks"
        AllowPaging="True"
        DataSourceID="SqlDataSource1"
        AutoGenerateInsertButton="True"
        AutoGenerateDeleteButton="True"
        AutoGenerateRows="False"
        DataKeyNames="ID"
        Runat="server" >
        <Fields>
        <asp:BoundField
            DataField="ID"
            HeaderText="ID"/>
        <asp:BoundField
            DataField="TITLE"
            HeaderText="TITLE"/>
        <asp:BoundField
            DataField="AUTHOR"
            HeaderText="AUTHOR"/>
        <asp:BoundField
            DataField="PRICE"
            HeaderText="PRICE"/>
        </Fields>
    </asp:DetailsView>


        <asp:SqlDataSource ID="SqlDataSource1" runat="server"
            ConnectionString="<%$ ConnectionStrings:DatabaseConnectionString1 %>"
            InsertCommand="INSERT INTO BOOK_LIST(ID, TITLE, AUTHOR, PRICE) VALUES (@ID, @TITLE, @AUTHOR, @PRICE)"
            ProviderName="<%$ ConnectionStrings:DatabaseConnectionString1.ProviderName %>"
            SelectCommand="SELECT [ID], [TITLE], [AUTHOR], [PRICE] FROM [BOOK_LIST]"
            DeleteCommand="DELETE FROM BOOK_LIST WHERE ID=@ID">
        </asp:SqlDataSource>
   
    </div>
    </form>
</body>
</html>

When we delete record, we need to supply a value for the DetailsView control's DataKeyNames property. Notice that a parameter named @ID is used to represent the value of the ID column in the DeleteCommand property. If we not do so then will get error when delete record. 

Note: Continue in Next Part.

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