Blazor MudTable - Null Dates in Table

For that syntax to work (using the conditional operator), you need to wrap the whole expression in script block, this is the same rule for string interpolation:

<MudTd DataLabel="EndDate" 
       Style="width: 160px">
    @(row.EndDate == null ? "" : Convert.ToDateTime(row.EndDate).ToString("dd/MM/yyyy"))
</MudTd>

Given that you are casting to a date, is the value even null in the first place? if it is a string, try IsNullOrEmpty / IsNullOrWhiteSpace ...

<MudTd DataLabel="EndDate" 
       Style="width: 160px">
    @(String.IsNullOrWhiteSpace(row.EndDate) ? "" : Convert.ToDateTime(row.EndDate).ToString("dd/MM/yyyy"))
</MudTd>

If the value is a nullable DateTime? then do not use Convert.ToDateTime or conditional operator (in-line if expression), just use String.Format which will implicitly convert a null value to an empty string:

<MudTd>@String.Format("{0:dd/MM/yyyy}", @row.EndDate)</MudTd>

Try this in MudBlazor here: https://try.mudblazor.com/snippet/QkcRFPmgFqxqgoRW