You use sort the item alphabethically on EditType dropdownlist column if you are using WebValueList, just set the property UseValueListForSorting to true to sort it by tthe text value.

AutoFilterSuggestion will work with any dateformat if the column datatype is DateTime and the formatting is done using DataFormatString property of the WebGridColumn. For example here is the snippet to format column RequiredDate to displayed as "dd.MM.yyyy hh:mm:ss":

<ISWebGrid:WebGridColumn Caption="RequiredDate" DataMember="RequiredDate" DataType="System.DateTime"
    EditType="CalendarCombo" Name="RequiredDate" Width="100px" DataFormatString="dd.MM.yyyy hh:mm:ss">
</ISWebGrid:WebGridColumn>

Please execute the columnset creation code once. In the sample you attached, the columnset will be created each time PrepareDataBinding is triggered, if you only execute the code once (while page is not PostBack) the page will display without any issue.

You could try using AdvancedFilterExpression by disabling AutomaticFilter in the RootTable and handling the WebGrid filtering yourself in order to achieve filtering more than one item. Attached is a similar sample of filtering more than one City or Country

Hi Glenn

I have still problem with AutoFilterSuggestion. Following code is from sample AutomaticFilterSuggestion.aspx. I have added property DataFormatString="dd.MM.yyyy HH:mm:ss" on columns BirthDate and HireDate. Please check this. I get Errormessages like attached pictures.

    <ISWebGrid:WebGrid ID="WebGrid1" runat="server" Height="300px" UseDefaultStyle="True"
        Width="100%" DataSourceID="AccessDataSource1">
        <RootTable DataKeyField="EmployeeID">
            <Columns>
                <ISWebGrid:WebGridColumn Caption="LastName" DataMember="LastName" Name="LastName"
                    Width="100px">
                </ISWebGrid:WebGridColumn>
                <ISWebGrid:WebGridColumn Caption="FirstName" DataMember="FirstName" Name="FirstName"
                    Width="100px">
                </ISWebGrid:WebGridColumn>
                <ISWebGrid:WebGridColumn Caption="Title" DataMember="Title" Name="Title" Width="100px">
                </ISWebGrid:WebGridColumn>
                <ISWebGrid:WebGridColumn Caption="TitleOfCourtesy" DataMember="TitleOfCourtesy" Name="TitleOfCourtesy"
                    Width="100px">
                </ISWebGrid:WebGridColumn>
                <ISWebGrid:WebGridColumn Caption="BirthDate" DataMember="BirthDate" DataType="System.DateTime"
                    Name="BirthDate" Width="200px" DataFormatString="dd.MM.yyyy HH:mm:ss">
                </ISWebGrid:WebGridColumn>
                <ISWebGrid:WebGridColumn Caption="HireDate" DataMember="HireDate" DataType="System.DateTime"
                    Name="HireDate" Width="200px" DataFormatString="dd.MM.yyyy HH:mm:ss">
                </ISWebGrid:WebGridColumn>
            </Columns>
        </RootTable>
        <LayoutSettings AutoFilterSuggestion="True">
        </LayoutSettings>
    </ISWebGrid:WebGrid>

In our environment the sample return no row and there is no such error as you described. Could you inform us the WebGrid build and WebUI Framework you are using in order to analyze this issue further.