C#WPF checkboxes

Question

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

private void Row_DoubleClick(object sender, MouseButtonEventArgs e)
    {

        sqliteCon.Open();

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

            var currentRowIndex = dataGrid1.Items.IndexOf(dataGrid1.CurrentItem);

            //FROM 0 TO 1
            // string q = "UPDATE tabList Set selection = '" + 1 + "' WHERE idL="+ (currentRowIndex= currentRowIndex+1);


            //TEST4
            string q = @"UPDATE tabList
                         SET selection = (CASE 
                                            WHEN tabList.selection.Value = ' 0 '
                                            THEN tabList.selection.Value = ' 1'
                                            ELSE tabList.selection.Value = '  0  '
                                        END)
                     WHERE idL = " + (currentRowIndex = currentRowIndex + 1);





            SqlCommand cmd = new SqlCommand(q, sqliteCon);
                cmd.ExecuteNonQuery();
                MessageBox.Show("Dato Modificato");

            }
        sqliteCon.Close();
    }

Answer 1

Please replace this.

 string q = @"UPDATE tabList
               SET selection = (CASE  WHEN " + tabList.selection.Value.ToString() + " = 0 " 
                                       + " THEN 1 ELSE   0  END) WHERE idL = " + (currentRowIndex + 1);

Answer 2

you might be missing the single quote symbol. Try replace it with this.

 //TEST4
        string q = @"UPDATE tabList
                     SET selection = (CASE 
                                        WHEN tabList.selection.Value = ' 0 '
                                        THEN tabList.selection.Value = ' 1'
                                        ELSE tabList.selection.Value = '  0  '
                                    END)
                 WHERE idL = '" + (currentRowIndex = currentRowIndex + 1) + "'";

please let me know if this working. :)