<DataGridTextColumn Header="Amount($)" Width="*" Binding="{Binding Path = Amount}">
<DataGridTextColumn.CellStyle>
<Style TargetType="DataGridCell">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=Tran_Code}" Value=**"DEP"**>
<Setter Property="IsEnabled" Value="False"/>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGridTextColumn.CellStyle>
</DataGridTextColumn>
Instead of just one values (as of now its DEP),the cell should be enabled for certain set of values