Hello,

UltraWebGrid supports validators for columns, so you can just use RequiredFieldValidator to make sure the text entered for a columns is not empty (Null). Here is an example:

<asp:RequiredFieldValidator ID="RequiredFieldValidator1" ControlToValidate="UltraWebGrid1" runat="server" ErrorMessage="ErrorMessage" EnableClientScript=true Display=Static>
  </asp:RequiredFieldValidator>
    <igtbl:UltraWebGrid ID="UltraWebGrid1" runat="server" Height="200px" Width="325px"
        DataSourceID="SqlDataSource1">
        <Bands>
            <igtbl:UltraGridBand>
                <Columns>
                    <igtbl:UltraGridColumn BaseColumnName="CustomerID" IsBound="True" Key="CustomerID">
                        <Header Caption="CustomerID">
                        </Header>                        
                    </igtbl:UltraGridColumn>
                    <igtbl:UltraGridColumn BaseColumnName="CompanyName" IsBound="True" Key="CompanyName">
                        <Header Caption="CompanyName">
                            <RowLayoutColumnInfo OriginX="1" />
                        </Header>
                        <Validators>
                            <igtbl:ValidatorItem  Value="RequiredFieldValidator1"  />
                        </Validators>
                         <Footer>
                            <RowLayoutColumnInfo OriginX="1" />
                        </Footer>
                    </igtbl:UltraGridColumn>

 More info can be found in the following forum thread:

http://forums.infragistics.com/forums/p/9092/68843.aspx#68843