Using ASP.NET Parameters with DataSource Controls : Parameters « Data Binding « ASP.NET Tutorial






  1. ASP.NET Tutorial
  2. Data Binding
  3. Parameters
The SqlDataSource, AccessDataSource, LinqDataSource, and ObjectDataSource controls all support the following types of Parameter objects:


Parameter:               Represents an arbitrary static value.

ControlParameter:        Represents the value of a control or page property.

CookieParameter:         Represents the value of a browser cookie.

FormParameter:           Represents the value of an HTML form field.

ProfileParameter:        Represents the value of a Profile property.

QueryStringParameter:    Represents the value of a query string field.

SessionParameter:        Represents the value of an item stored in Session state.

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show Control Parameter</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <asp:DropDownList
        id="ddlProductCategory"
        DataSourceID="srcProductCategories"
        DataTextField="Name"
        DataValueField="Id"
        Runat="server" />

    <asp:Button
        id="btnSelect"
        Text="Select"
        ToolTip="Select Product"
        Runat="server" />

    <hr />

    <asp:GridView
        id="grdProducts"
        DataSourceID="srcProducts"
        Runat="server" />

    <asp:SqlDataSource
        id="srcProductCategories"
        ConnectionString="Server=.\SQLExpress;
        Trusted_Connection=True;AttachDbFileName=|DataDirectory|MyDatabase.mdf;
        User Instance=True"
        SelectCommand="SELECT Id,Name FROM ProductCategories"
        Runat="server" />


    <asp:SqlDataSource
        id="srcProducts"
        ConnectionString="Data Source=.\SQLExpress;
            AttachDbFilename=|DataDirectory|MyDatabase.mdf;
            Integrated Security=True;User Instance=True"
        SelectCommand="SELECT Title,Director FROM Products
            WHERE CategoryId=@Id"
        Runat="server">
        <SelectParameters>
            <asp:ControlParameter
                Name="Id"
                Type="int32"
                ControlID="ddlProductCategory" />
        </SelectParameters>
    </asp:SqlDataSource>

    </div>
    </form>
</body>
</html>








19.22.Parameters
19.22.1.Using ASP.NET Parameters with DataSource Controls
19.22.2.Collection with ObjectDataSource