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DataSet writeXMLSchema = new DataSet();
writeXMLSchema = (DataSet)Accounts.DataSource;
writeXMLSchema.WriteXml("AccountDaten.xml");
Accounts.DataSource = writeXMLSchema;					

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DataSet readXMLSchema = new DataSet();
writeXMLSchema.ReadXml("AccountDaten.xml");
Accounts.DataSource = readXMLSchema;					

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DataSet dataset = new DataSet();
DataTable table = new DataTable("Accounts");

// fill dataset table...
datatable.ReadXml("AccountDaten.xml");

dataset.Tables.Add(table); // Tabelle dem DataSet hinzuzufügen

datagridview.DataSource = table; // bzw. dataset["Accounts"]					

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table.WriteXml("AccountDaten.xml");
// bzw.
dataset["Accounts"].WriteXml("AccountDaten.xml");					

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DataRow row = table.NewRow();

// Set values in the columns:
row["EMail"] = "info@test.de";
row["Password"] = "MyPassword";

// add the row to the rows collection.
table.Rows.Add(row);