how to create xsd to validate excel file

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C#

MS-Excel

XSD

good morning, i am in a win application in c# language. i have to read a excel file (both xls and xlsx) and i would validate it with an xsd file but i wrong something because i get an error: data at the root level is invalid. Line 1, position 1 if i use the same xsd with corrispondent xml file this work correctly so shoul be a problem in my excel file or in a code to validate my excel file. i have use this code:
XmlReaderSettings booksSettings = new XmlReaderSettings();
booksSettings.Schemas.Add("http://www.w3.org7XMLSchema",XMLImportUsers.xsd");
booksSettings.ValidationType = ValidationType.Schema;
XmlReader books = XmlReader.Create(@"D:\test.xml",booksSettings);

while (books.Read()) { }

<pre lang="xml">my xsd

&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
&lt;xs:schema xmlns:xs=&quot;http://www.w3.org/2001/XMLSchema&quot;&gt;
&lt;xs:element name=&quot;UserSettings&quot;&gt;
&lt;xs:complexType&gt;
&lt;xs:sequence&gt;
&lt;xs:element name=&quot;ID_UTENTE&quot; type=&quot;xs:decimal&quot; minOccurs=&quot;1&quot; maxOccurs=&quot;1&quot;/&gt;
&lt;xs:element name=&quot;ID_GRUPPO&quot; type=&quot;xs:decimal&quot; minOccurs=&quot;0&quot; maxOccurs=&quot;1&quot;/&gt;
etc etc

Can you help me and post a code example to validate xls /xlsx fine from an xsd? thanks in advance</pre>