Parsing Directory Info using Module in C# DOT NET

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C#

Can any one help me out with following. I am trying to parse the folders and sub folders.I tried several ways but no luck.Using the Module. But I am getting the following error.The error is Value cannot be null parameter name:path.Below is the code,can anyone tell me where i am making the mistake.

public struct Kbpathbase
        {
public string project;
}
public static Module1.Kbpathbase kb; 

=========In the Crate new form i have passed the following code ==========

private void parseProjects()
        {
            int i;
            DirectoryInfo[] arrDirectoryInfo;
            try
            {
                lv.Items.Clear();
                DirectoryInfo directoryInfo1 = new DirectoryInfo(Module1.kb.project);
                arrDirectoryInfo = directoryInfo1.GetDirectories();
                i = 0;
                while (i < arrDirectoryInfo.Length)
                {
                    lv.Items.Add(arrDirectoryInfo[i].Name, 0);
                    i++;
                }
            }
            catch (Exception exception1)
            {
                Interaction.MsgBox(exception1.Message, MsgBoxStyle.Critical, null);
                Information.Err().Clear();
            }

        }