FdoToolbox.Base.Controls.FdoBulkUpdateCtl.txtUpdateFilter_Click C# (CSharp) Method

        private void txtUpdateFilter_Click(object sender, EventArgs e)
        {
            if (_classDef == null)
            {
                using (FdoFeatureService service = _conn.CreateFeatureService())
                {
                    _classDef = service.GetClassByName(this.ClassName);
                }
            }
            if (!string.IsNullOrEmpty(this.Filter))
            {
                string filter = ExpressionEditor.EditExpression(_conn, _classDef, null, this.Filter, ExpressionMode.Filter);
                if (filter != null)
                    this.Filter = filter;
            }
            else
            {
                this.Filter = ExpressionEditor.NewExpression(_conn, _classDef, null, ExpressionMode.Filter);
            }
        }