How to add resource string in properties.en.resx files in windows project C#

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C#

I have two resource files under Properties in Windows c# Project viz.
1).Properties.en.Resx
2).Properties.tr.Resx


I am not able to add Resource in Properties.en.Resx or in Properties.tr.Resx
Please help me regarding this

What I have tried:

using (ResXResourceWriter resx = new ResXResourceWriter(@"Properties.en.Resx"))
{
resx.AddResource("Title", "Classic American Cars");
resx.Generate();
}
//not reflecting above resource after reading in below code

strs = new List<dictionaryentry>();

ResourceSet rs=ResourceManager.GetResourceSet(CultureInfo, true, false);
IEnumerator e = rs.GetEnumerator();
while (e.MoveNext())
{

strs.Add((DictionaryEntry)e.Current);
}
grdResources.DataSource = strs;

Using Above ,am able to get list