怎样datagridview与Excel和Xml文件之间的转换问题

RT.
我的页面中包括3个控件,1个datagridview控件,2个button控件,button1要实现的功能是读取Excel文件,并显示在datagridview控件中,代码如下:
C# code:

private void button1_Click(object sender, EventArgs e)
{

OpenFileDialog fd = new OpenFileDialog();
fd.Filter = "表格|*.xls";
string strPath;
if (fd.ShowDialog() == DialogResult.OK)
{
try
{
strPath = fd.FileName;
string strCon = "provider=microsoft.jet.oledb.4.0;data source=" + strPath + ";extended properties=excel 8.0";
OleDbConnection Con = new OleDbConnection(strCon);
Con.Open();
string strSql = "select * from[Sheet1$]";
OleDbCommand Cmd = new OleDbCommand(strSql, Con);
OleDbDataAdapter da = new OleDbDataAdapter(Cmd);
DataSet ds = new DataSet();
da.Fill(ds);
Con.Close();
dataGridView1.DataSource = ds.Tables[0];

}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}


由于上述代码要多次使用