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This is the code and i have error to the bold peace :

var isIdSortable = Convert.ToBoolean(Request["bSortable_1"]);

           var isNameSortable = Convert.ToBoolean(Request["bSortable_2"]);
           var isAddressSortable = Convert.ToBoolean(Request["bSortable_3"]);
           var isTownSortable = Convert.ToBoolean(Request["bSortable_4"]);

           var sortColumnIndex = Convert.ToInt32(Request["iSortCol_0"]);
           Func<Order, string> orderingFunction = (c =>  sortColumnIndex == 1 && isIdSortable ? c.OrderID :
             sortColumnIndex == 2 && isNameSortable ? c.CustomerID :
                                                          sortColumnIndex == 3 && isAddressSortable ? c.ShipAddress :
                                                          sortColumnIndex == 4 && isTownSortable ? c.ShipCountry :
                                                          "");



OrderID is INT , CustomerID Adress and Country are string

What I have tried:

i just explained the problem above in the section
Posted
Updated 16-May-17 3:32am

As the error message says, one of the properties you're trying to return is defined as an int, and can't be implicitly converted to a string. I would suspect either OrderID, CustomerID, or both.

You'll need to add a .ToString() call to the int property.
c.OrderID.ToString()

It would probably also be better to move the conditional access outside of the Func, so that you only evaluate it once:
Func<Order, string> orderingFunction;
if (sortColumnIndex == 1 && isIdSortable)
{
    orderingFunction = c => c.OrderID.ToString();
}
else if (sortColumnIndex == 2 && isNameSortable)
{
    orderingFunction = c => c.CustomerID.ToString();
}
else if (sortColumnIndex == 3 && isAddressSortable)
{
    orderingFunction = c => c.ShipAddress;
}
else if (sortColumnIndex == 4 && isTownSortable)
{
    orderingFunction = c => c.ShipCountry; // Really? Is it the town, or the country?
}
else
{
    orderingFunction = c => string.Empty;
}
 
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use

c.OrderID.ToString()


rather than

c.OrderID
 
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