Insert C# table data into a SQL Server table

Yes there is a way:

        DataTable dataTable = null; // your data needs to be here
        try
        {
            ConnectionStringSettings mConString = ConfigurationManager.ConnectionStrings["SiteSqlServer"];

            // Optional truncating old table
            using (SqlConnection connection = new SqlConnection(mConString.ConnectionString))
            {
                connection.Open();
                // Delete old entries
                SqlCommand truncate = new SqlCommand("TRUNCATE TABLE MYTABLE", connection);
                truncate.ExecuteNonQuery();
            }

            SqlBulkCopy bulkCopy = new SqlBulkCopy(mConString.ConnectionString, SqlBulkCopyOptions.TableLock)
                                          {
                                              DestinationTableName = "dbo.MYTABLE",
                                              BatchSize = 100000,
                                              BulkCopyTimeout = 360
                                          };
            bulkCopy.WriteToServer(dataTable);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex);
        }

Please experiement with the BatchSize - 100000 was good for me - it should not be larger than that - speed migth decrease otherwise. BatchSize does not limit your data - it's just the size of each "packet" that will be sent to the sql server.

SiteSQLServer should be inside your app.config or web.config. You need to change the parameters here if not.

Please change MYTABLE to your table name.