C# 导入多个工作薄文件

DataTable dt = new DataTable();
                System.Data.DataTable ExcelTable;
                DataSet dst = new DataSet();
                string strconn = "";
            
                if (this.currFileExtension==".xls")//这样判断不太好 暂时未找出判断Excel版本的解决办法
                {
                    strconn = "provider=microsoft.jet.oledb.4.0;" + "data source=" + currFilePath + ";" + "extended properties=excel 8.0;";
                }
                else {
                    strconn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + currFilePath + ";Extended Properties=\"Excel 12.0;HDR=YES\"";
                }
              
                OleDbConnection objConn = new OleDbConnection(strconn);
                objConn.Open();
                System.Data.DataTable schemaTable = objConn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);
                
                for (int i = 0; i < schemaTable.Rows.Count; i++)
                {
                    string tableName = schemaTable.Rows[i][2].ToString().Trim();//获取 Excel 的表名，默认值是sheet1
                    string strSql = "select * from [" + tableName + "]";
                    OleDbDataAdapter myData = new OleDbDataAdapter(strSql, objConn);
                    myData.Fill(dst, tableName);//填充数据
                    ExcelTable = dst.Tables[tableName];
                    dt = dst.Tables[tableName];
                    objConn.Close();
                    --循环调用写入数据库
                   
                }