Cannot find Any method of IEnumerable<> to do empty check

Question

I have a method where I am returning IEnumerable<Data> and I wanted to check whether IEnumerable is null/empty or not. I did some research and it looks like we can use Any method of it but in my code I don't see any Any method in it so that means I am running older version of .Net?

Now I am using above method as below -

private bool Process()
{
    IEnumerable<Data> dataValue = GetData();
    // check if dataValue is null or empty
    if(dataValue != null) {
        // process entry
    }
}

What can I do to check if IEnumerable is null or empty in my case?

Update

private bool Process()
{
    IEnumerable<Data> dataValue = GetData();
    if(dataValue = null || !dataValue.Any()) {
        return false;
    }
    foreach (var x in dataValue)
    {
        // iterating over dataValue here and extracting each field of Data class
    }
}

Answer 1

There is no need for an explicit Any check or null check.

foreach (var x in (dataValue ?? Enumerable.Empty<Data>()))

is what I would suggest, since it avoids the double enumeration problem of using Any (and it treats null as equivalent to empty). So this might look like:

private bool Process()
{
    bool returnValue = false;
    IEnumerable<Data> dataValue = GetData();
    foreach (var x in (dataValue ?? Enumerable.Empty<Data>()))
    {
        returnValue = true;
        // iterating over dataValue here and extracting each field of Data class
    }

    return returnValue;
}