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using System.Data.OleDb;
using System.Data;

string strOdbcCon = @"Provider=Microsoft.Jet.OLEDB.4.0; Persist Security Info=False;Data Source=c://test.xls; Extended Properties=Excel 8.0";
            //定义OleDbConnection对象实例并连接Excel表格               
            OleDbConnection OleDB = new OleDbConnection(strOdbcCon);
            //定义OleDbDataAdapter对象实例并调用Select查询语句提取Excel数据信息              
            OleDbDataAdapter OleDat = new OleDbDataAdapter("select * from [登记表$]", OleDB);
            //OleDbDataAdapter OleDat = new OleDbDataAdapter("select * from [sheet2$]", OleDB);
            //OleDbDataAdapter OleDat = new OleDbDataAdapter("select * from [sheet3$]", OleDB);

            DataTable dt = new DataTable();
            //定义DataTable对象实例              
            OleDat.Fill(dt);