Why changed values in a foreach don't save?

[cit]

I don't belive in my eyes. I wrote a foreach to change a bool value... (bool FileEntry.selected)

int i=-1;
    foreach (FileEntry itmFile, fileList)
    {
    i++;
        if((tmpType=="alle")||(itmFile.type==tmpType))  //Stimmt Typ?
        {
            if(itmFile.size+currentSize<maxSize)        //Begrenzung noch nicht überschritten?
            {
                currentSize += itmFile.size;
                //itmFile.selected=true;                  //wird ausgewählt
                fileList[i].selected=true;
                continue;
            }
        }
        //itmFile.selected=false;                         //wird nicht ausgewählt
        fileList[i].selected=false;
    }

int i=-1;
    foreach (FileEntry itmFile, fileList)
    {
    i++;
        if((tmpType=="alle")||(itmFile.type==tmpType))  //Stimmt Typ?
        {
            if(itmFile.size+currentSize<maxSize)        //Begrenzung noch nicht überschritten?
            {
                currentSize += itmFile.size;
                //itmFile.selected=true;                  //wird ausgewählt
                fileList[i].selected=true;
                continue;
            }
        }
        //itmFile.selected=false;                         //wird nicht ausgewählt
        fileList[i].selected=false;
    }

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..and the (now) commted entries like "itmFile.selected=true" change the value only for/in the foreach! After the foreach is done, the value is false, like before. But when i use something like "fileList[i].selected=true", the value is after leaving the foreach is still 'true'. Is that normal???


thx.cit