decimal and double ToString problem

decimal d2 = 0.0000002500m;
Console.WriteLine(d2.ToString());

double d3 = 0.0000002500;
Console.WriteLine(d3.ToString());

输出结果是，

0.0000002500
2.5E-07

double在ToString的时候，直接进行了科学计数法。

 DataTable dataTable = new DataTable();
            DataColumn dataColumn = new DataColumn();
            dataColumn.ColumnName = "column1";
            dataColumn.DataType = typeof(decimal);
            dataTable.Columns.Add(dataColumn);

            DataColumn dataColumn2 = new DataColumn();
            dataColumn2.ColumnName = "column2";
            dataColumn2.DataType = typeof(decimal);
            dataTable.Columns.Add(dataColumn2);
            decimal d2 = 0.0000002500m;
            string value2 = d2.ToString();
            Console.WriteLine(value2);


            double d3 = 0.0000002500;
            string value3 = d3.ToString();
            Console.WriteLine(d3.ToString());

            var dataRow = dataTable.NewRow();
            try
            {
                dataRow["column1"] = value2;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            dataRow["column2"] = value3;
            Console.WriteLine(dataRow["column1"]);
            Console.WriteLine(dataRow["column2"]);

需要把这个代码中的decimal修正为double。或者把数据源，修正为decimal

dataColumn2.DataType = typeof(decimal);