C#WPF checkboxes connected to DB SQL

I'm stuck with a problem regarding checkboxes from a WPF application to a SQL database.

I've arrived at a point where I can update the value of a specific item into the database but I can only update the value or from 0 to 1 or from 1 to 0, I'm searching for an IF Statement kind of thing, and I think I'm near the solution but the code isn't working and gives me the error" there's an error near =" PLEASE HELP

        private void Row_DoubleClick(object sender, MouseButtonEventArgs e)
    {

        sqliteCon.Open();

        if (sqliteCon.State == System.Data.ConnectionState.Open)
            {

            var currentRowIndex = dataGrid1.Items.IndexOf(dataGrid1.CurrentItem);//PER IDENTIFICARE LA LINEA CORRENTE


            //PROVA5
            string q = @"UPDATE tabList
                 SET selection = (CASE Prova
                                    WHEN tabList.selection.Value = ' 0 '
                                    THEN tabList.selection.Value = ' 1'
                                    ELSE tabList.selection.Value = ' 0 '
                                END)
             WHERE idL = @CURRENT";


                SqlCommand cmd = new SqlCommand(q, sqliteCon);
            cmd.Parameters.AddWithValue("@CURRENT", currentRowIndex = currentRowIndex + 1);
            cmd.ExecuteNonQuery();
                MessageBox.Show("Dato Modificato");

            }
        sqliteCon.Close();
    }