How to set SelectCommand to change 'WHERE' to logged in user - sql

Question

I've been working on webforms and per user data on ASP.NET where if a user logs in, they get their data.
I have a table where it takes the sqldatasource from an asp markup code:
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:DefaultConnection %>"
ProviderName="<%$ ConnectionStrings:DefaultConnection.ProviderName %>"
SelectCommand="SELECT [first_name], [last_name], [weight_data] FROM [userData]
WHERE [email]='test#test.com';">
</asp:SqlDataSource>
I can get the currently logged in email string through <%: Context.User.Identity.GetUserName() %>
How would I put that into the WHERE email statement so I can take currently logged in user's email and replace it with 'test#test.com' to match it on the SQL table to get the other data?
Thanks a lot!

Answer 1

Different ways like:
You can use the built in OnSelecting parameter of asp:SqlDataSource
<asp:SqlDataSource ID="SqldsExample" runat="server"
SelectCommand="SELECT [first_name], [last_name], [weight_data] FROM [userData]
WHERE [email]=#UserEmail"
OnSelecting="SqldsExample_Selecting">
<SelectParameters>
<asp:Parameter Name="UserEmail" Type="String"/>
</SelectParameters>
In code-behind
protected void SqldsExample_Selecting(object sender, SqlDataSourceCommandEventArgs e)
{
e.Command.Parameters["UserEmail"].Value = Context.User.Identity.GetUserName();
}
Another way:
SqlDataSource1.SelectParameters.Add("#UserEmail", Context.User.Identity.GetUserName());
Hope this helps!