[Solved] My code return cannot implicitly convert int to bool


You can’t test multiple values this way, you have to specify the test value each time:

CssClass = 
(idee.IdTypeEtatIdee == (int)EnumTypeEtatIdee.example? "example" : 
(idee.IdTypeEtatIdee == (int)EnumTypeEtatIdee.exampletwo ? "Aletude" :
(idee.IdTypeEtatIdee == (int)EnumTypeEtatIdee.examplethree? "Encours" :
(idee.IdTypeEtatIdee == (int)EnumTypeEtatIdee.examplefour ? "examplefour " : 
(idee.IdTypeEtatIdee == (int)EnumTypeEtatIdee.examplefive ? "examplefive " : "null")))))

You could instead use a switch to accomplish the same thing

var CssClass = "null";
switch((EnumTypeEtatIdee)idee.IdTypeEtatIdee){
    case EnumTypeEtatIdee.example:
        CssClass = "example";
        break;
    case EnumTypeEtatIdee.exampletwo:
        CssClass = "Aletude";
        break;
    case EnumTypeEtatIdee.examplethree:
        CssClass = "Encours";
        break;
    case EnumTypeEtatIdee.examplefour:
        CssClass = "examplefour";
        break;
    case EnumTypeEtatIdee.examplefive:
        CssClass = "examplefive";
        break;
}

Or a dictionary:

var myDict = new Dictionary<EnumTypeEtatIdee, string>(){
    {EnumTypeEtatIdee.example, "example"},
    {EnumTypeEtatIdee.exampletwo, "Aletude"},
    {EnumTypeEtatIdee.examplethree, "Encours"},
    {EnumTypeEtatIdee.examplefour, "examplefour"},
    {EnumTypeEtatIdee.examplefive, "examplefive"},
};

var CssClass = "null";
if (myDict.ContainsKey((EnumTypeEtatIdee)idee.IdTypeEtatIdee)){
    CssClass = myDict[(EnumTypeEtatIdee)idee.IdTypeEtatIdee];
}

solved My code return cannot implicitly convert int to bool