Regarding xmlSchema information from dataset

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C#

C#4.0

Dear Friends,

Here i want to know how to get Schema Information from dataset,Actually i have written a code like this.

for (int i = 0; i < ds.Tables.Count; i++)
               {
                   ds.Tables[i].WriteXml(filepath + "/" + "tblTeachers" + ".xml");
                   xmlDoc = new XmlDocument();
                   xmlDoc.PreserveWhitespace = true;
                   xmlDoc.Load(filepath + "/" + "tblTeachers" + ".xml");
                   //Encrypt(xmlDoc, " ", rsaKey, "rsaKey");
                   xmlDoc.Save(filepath + "/" + "tblTeachers" + ".xml");

               }

From this iam importing dataset information to Xml its working fine.But i want the Datatypes of perticular table means

Coloumn Names       DataType  AllowNulls

intTeacherID        int       No

i want the datatype information throgh xmal schema


Regards,

Anilkumar.D