Kod:
OleDbConnection cnn= new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=ExcelDosyaAdiAdresi.xlsx; Extended Properties='Excel 12.0 Xml;HDR=YES'");
DataTable tbl = new DataTable();
cnn.Open();
tbl.Clear();
OleDbDataAdapter da = new OleDbDataAdapter("SELECT * FROM [ExceldekiSayfaAdi$]", cnn);
da.Fill(tbl);
dataGridView1.DataSource = tbl;
cnn.Close();