Creating columns programmatically in SharePoint 2010 / Code to create columns programmatically in SharePoint 2010

try

            {

                SPSecurity.RunWithElevatedPrivileges(delegate()

                   {

                       using (SPSite osite = new SPSite("http://myserver02:7676"))

                       {

                           using (SPWeb oweb = osite.OpenWeb())

                           {

                               string columnName = "Test";

                               string columnType = "Single line of text";

                               if (columnType.Equals("Single line of text"))

                                   oweb.Fields.Add(columnName, SPFieldType.Text, false);

                               if (columnType.Equals("Date and Time"))

                                   oweb.Fields.Add(columnName, SPFieldType.DateTime, false);

                               if (columnType.Equals("Choice"))

                                   oweb.Fields.Add(columnName, SPFieldType.Choice, false);

                               oweb.Update();

                           }

                       }

                   });

            }

            catch (Exception ex)

            {

               

            }

Now you can navigate to Site Settings -> Galleries ->Site Columns

In this list look for Custom Coloumns Heading in which you would be able to find your column

Tada ! 

Additional Logic Advice : what you can do is,create and xml with the column names and column types and read this xml and create columns programmatically 

Happy SharePointing :)