Question

Working on setting up a SqlDataSource connecting MySQL database to a ASP .NET GridView.

The Delete Command is:

DeleteCommand="DELETE FROM troutetracking WHERE id=?id" 

The Delete parameter is:

<DeleteParameters>
     <asp:Parameter Name="id"  Type="Int32" />
</DeleteParameters>

When I run a delete link on the Gridview the following error message appears:

MySql.Data.MySqlClient.MySqlException: Parameter ‘?id’ must be defined.

What is the proper syntax?

Answer 1

This blog ran into a similar issue:

link text

What I needed to do was update the connection to string to contain “Allow User Variables=True”.

I did this by using the ‘Advanced’ button when setting up the data source.

The delete query also needed to be tweaked to be:

DeleteCommand="DELETE FROM troutetracking WHERE id=@id"