I get a null reference error on the line where I use Name

Question

var category = await _companyContext.PRODUCTCATEGORIES.FirstOrDefaultAsync(p => p.ID == categoryId && (bool)p.STATE);

            category.NAME = name;
            category.WORKPLACEID = workplaceid;
            _companyContext.Update(category);

My problem is in the line with NAME

Answer 1

FirstOrDefaultAsync will return either an instance or null. Therefore, you should always check the return value for null e.g.,

var category = await _companyContext.PRODUCTCATEGORIES.FirstOrDefaultAsync(p => p.ID == categoryId && (bool)p.STATE);

if(category!=NULL)
{
        category.NAME = name;
        category.WORKPLACEID = workplaceid;
        _companyContext.Update(category);
}

Without the full exception text being posted I suspect that category == NULL is true