GridView SelectParameter from code behind - vb.net

Question

I am using VB.NET webforms.
I have a GridView which brings data from Database when the page loads. The SQLDataSource with Select SQL is as follows:
<asp:SqlDataSource
ID="ScopeDataSource"
runat="server"
ConnectionString="<%$ ConnectionStrings:SQLServerConnectionString %>"
SelectCommand="SELECT [SCO_LINENUM], [SCO_LINETEXT], [SCO_SCOPEID], [SCO_TAB1LINK], [SCO_TAB2LINK], [SCO_TAB3LINK] FROM [SCOPE] WHERE [SCO_SCOPEID] = 'AAAREN02'"></asp:SqlDataSource>
My GridView is as follows:
<asp:GridView
ID="ScopeGrid"
runat="server"
DataSourceID="ScopeDataSource"
AutoGenerateColumns="False"
GridLines="None"
DataKeyNames="SCO_SCOPEID, SCO_LINENUM">
<Columns>
<asp:BoundField DataField="SCO_LINENUM" HeaderText="Sr#" SortExpression="SCO_LINENUM">
<HeaderStyle Height="40px" />
<ItemStyle Width="30px" />
</asp:BoundField>
<asp:BoundField DataField="SCO_LINETEXT" HeaderText="Parameter.." SortExpression="SCO_LINETEXT">
<HeaderStyle Height="40px" />
<ItemStyle Width="100px" />
</asp:BoundField>
<asp:TemplateField HeaderText="Operator Values...........">
<ItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" CssClass="DropDownMargin">
<asp:ListItem>BETWEEN</asp:ListItem>
<asp:ListItem>EQUALTO</asp:ListItem>
<asp:ListItem>GREATERTHAN</asp:ListItem>
<asp:ListItem>LESSTHAN</asp:ListItem>
</asp:DropDownList>
<asp:TextBox runat="server" ID="RangeStart" Text="None" Width="50px" CssClass="TextBoxMargin"></asp:TextBox>
<asp:TextBox runat="server" ID="RangeEnd" Text="None" Width="50px"></asp:TextBox>
</ItemTemplate>
<HeaderStyle Height="40px" CssClass="WhiteSpacePreserve" />
</asp:TemplateField>
<asp:BoundField DataField="SCO_SCOPEID" HeaderText="ScopeID" SortExpression="SCO_SCOPEID">
<HeaderStyle CssClass="hidegrid" />
<ItemStyle CssClass="hidegrid" />
</asp:BoundField>
<asp:BoundField DataField="SCO_TAB1LINK" HeaderText="Tab1" SortExpression="SCO_TAB1LINK" />
<asp:BoundField DataField="SCO_TAB2LINK" HeaderText="Tab2" SortExpression="SCO_TAB2LINK" />
<asp:BoundField DataField="SCO_TAB3LINK" HeaderText="Tab3" SortExpression="SCO_TAB3LINK" />
</Columns>
</asp:GridView>
As seen in above SQLDataSource, the WHERE clause is hard-coded. I want to make this dynamic by passing a variable to the WHERE clause from code-behind. Also My Page_Load event is empty. So far, since the SQLDataSource WHERE clause is hard-coded in my aspx I can see the data in gridview but I don't know how to send a variable to it from code-behind?

Answer 1

Something like this would work.
Change your select command to
SELECT [SCO_LINENUM], [SCO_LINETEXT], [SCO_SCOPEID], [SCO_TAB1LINK], [SCO_TAB2LINK], [SCO_TAB3LINK] FROM [SCOPE] WHERE [SCO_SCOPEID] = #SCO_SCOPEID
Then do like
ScopeDataSource.SelectParameters("SCO_SCOPEID").DefaultValue = Your value