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string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source='f:\\2222.xls';Extended Properties=Excel 8.0";
OleDbConnection conn = new OleDbConnection();
conn.ConnectionString = strConn;
conn.Open();
DataTable dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
conn.Close();
dataGridView1.DataSource = dt;
dataGridView1.Refresh();