SQL Server - Bulk data import using .Net SqlBulkCopy Class

1. Create table in database (skip this step if you can use existing table)

CREATE TABLE [dbo].[ProductOrder](
	[ProductOrderID] [int] IDENTITY(1,1) NOT NULL,
	[OrderID] [int] NULL,
	[Value] [int] NULL,
	[Length] [int] NULL,
	[Breadth] [int] NULL,
	[TotalVolume] [decimal](18, 2) NULL,
CONSTRAINT [PK_ProductOrder] PRIMARY KEY CLUSTERED
(
	[ProductOrderID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

2. C#.net code

2.1 Read data in DataTable from any source(excel, csv etc..)
2.2 Create instance of SqlBulkCopy class and map DataTable columns to Database table
2.3 Use WriteToServer method of SqlBulkCopy class to load data into Database

private void DataImport()
{
    //Creates a datatable and add few dummy records
    DataTable orderDetail = new DataTable("ItemDetail");
    orderDetail.Columns.Add(new DataColumn("ID", Type.GetType("System.Int32")));
    orderDetail.Columns.Add(new DataColumn("value", Type.GetType("System.Int32")));
    orderDetail.Columns.Add(new DataColumn("length", Type.GetType("System.Int32")));
    orderDetail.Columns.Add(new DataColumn("breadth", Type.GetType("System.Int32")));
    orderDetail.Columns.Add(new DataColumn("total", Type.GetType("System.Decimal")));
    orderDetail.Columns["total"].Expression = "value/(length*breadth)";

    //Adding dummy entries
    DataRow dr = orderDetail.NewRow();
    dr["ID"] = 1;
    dr["value"] = 50;
    dr["length"] = 5;
    dr["breadth"] = 8;
    orderDetail.Rows.Add(dr);

    dr = orderDetail.NewRow();
    dr["ID"] = 2;
    dr["value"] = 60;
    dr["length"] = 15;
    dr["breadth"] = 18;
    orderDetail.Rows.Add(dr);
    //Adding dummy entries

    string connect = @"Data Source=.\sqlexpress;Persist Security Info=True;Initial Catalog=tempdb;User ID=username;Password=password;"; //your "ConnectionString" goes here

    using (SqlConnection cn = new SqlConnection(connect))
    using (SqlBulkCopy bcp = new SqlBulkCopy(cn))
    {
	cn.Open();
	//Column mapping..
	bcp.DestinationTableName = "ProductOrder";//Here 'ProductOrder' is database table name, Make sure have 'ProductOrder' into database
	bcp.ColumnMappings.Add("ID", "OrderID"); //Here 'ID' is a datatable column name and 'OrderID' is a sql table columname
	bcp.ColumnMappings.Add("value", "Value");//Here 'value' is a datatable column name and 'Value' is a sql table columname
	bcp.ColumnMappings.Add("length", "Length");//Here 'length' is a datatable column name and 'Length' is a sql table columname
	bcp.ColumnMappings.Add("breadth", "Breadth"); //Here 'breadth' is a datatable column name and 'Breadth' is a sql table columname
	bcp.ColumnMappings.Add("total", "TotalVolume"); //Here 'total' is a datatable column name and 'TotalVolume' is a sql table columname
	//Column mapping..
	bcp.WriteToServer(orderDetail);
    }
}