public class TableDescription : Description 

public void RenameTableSnippet(Geodatabase geodatabase)
{
  //Renaming a table from 'Original_Table' to 'Renamed_Table'

  string tableToBeRenamed = "Original_Table";
  string tableRenameAs = "Renamed_Table";

  TableDefinition tableDefinition = geodatabase.GetDefinition<TableDefinition>(tableToBeRenamed);

  SchemaBuilder schemaBuilder = new SchemaBuilder(geodatabase);

  // Table rename 
  schemaBuilder.Rename(new TableDescription(tableDefinition), tableRenameAs);
  schemaBuilder.Build();
}

public void RemoveFieldTableSnippet(Geodatabase geodatabase)
{
  // Removing all fields from 'Parcels' table except following 
  // Tax_Code
  // Parcel_Address

  // The table to remove fields
  string tableName = "Parcels";

  TableDefinition tableDefinition = geodatabase.GetDefinition<TableDefinition>(tableName);
  IReadOnlyList<Field> fields = tableDefinition.GetFields();

  // Existing fields from 'Parcels' table
  Field taxCodeField = fields.First(f => f.Name.Equals("Tax_Code"));
  Field parcelAddressField = fields.First(f => f.Name.Equals("Parcel_Address"));

  FieldDescription taxFieldDescription = new FieldDescription(taxCodeField);
  FieldDescription parcelAddressFieldDescription = new FieldDescription(parcelAddressField);

  // Fields to retain in modified table
  List<FieldDescription> fieldsToBeRetained = new List<FieldDescription>()
  {
    taxFieldDescription, parcelAddressFieldDescription
  };

  // New description of the 'Parcels' table with the 'Tax_Code' and 'Parcel_Address' fields
  TableDescription modifiedTableDescription = new TableDescription(tableName, fieldsToBeRetained);

  SchemaBuilder schemaBuilder = new SchemaBuilder(geodatabase);

  // Remove all fields except the 'Tax_Code' and 'Parcel_Address' fields
  schemaBuilder.Modify(modifiedTableDescription);
  schemaBuilder.Build();
}