show data grid view of xml in C# form application

[jone kim]

I do the code:
*****************
DataSet ds=new DataSet();
ds.ReadXml("PhoneBookDirectory.xml");
datagridview1.DataSource=ds.Tables(0);
**********
displays:
the name datagridview1 does not exist in the current context
Non-invocable member 'System.Data.DataSet.Tables' cannot be used like a method.
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private void butLoad2_Click(object sender, EventArgs e)
{
DataSet myDatadSet=new DataSet();
myDatadSet.ReadXml("PhoneBookDirectory.xml");
dg1.DataSource=ds;
dg1.Bind();
****************
the name dg1 does not exist in the current context
the name ds does not exist in the current context

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When I copied the full path of the xml file and put it in the code:

myDatadSet.ReadXml("E:\projects\xml\practice\PhoneBook\PhoneBook\PhoneBookDirectory.xml");

it showed:

Unrecognized escape sequence
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Why is it so?