Import Excel Data Into An ASP.NET GridView using OLEDB

using System.Data.OleDb;
using System.Data;
public partial class UploadD : System.Web.UI.Page{
protected void Page_Load(object sender, EventArgs e)
{
string cnstr = “Provider=Microsoft.Jet.Oledb.4.0;Data Source=C:\a.xls;”+ “Extended Properties=Excel 8.0″;
OleDbConnection oledbConn = new OleDbConnection(cnstr);
string strSQL = “SELECT * FROM [Sheet$]“;
OleDbCommand cmd = new OleDbCommand(strSQL, oledbConn);
DataSet ds = new DataSet();
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
}
}