<PackageReference Include="NETStandard.Library" Version="2.0.0-preview2-25401-01" />

System.Data.DataColumnCollection

namespace System.Data { public sealed class DataColumnCollection : InternalDataCollectionBase { public DataColumn this[int index] { get; } public DataColumn this[string name] { get; } public event CollectionChangeEventHandler CollectionChanged; public DataColumn Add(); public void Add(DataColumn column); public DataColumn Add(string columnName); public DataColumn Add(string columnName, Type type); public DataColumn Add(string columnName, Type type, string expression); public void AddRange(DataColumn[] columns); public bool CanRemove(DataColumn column); public void Clear(); public bool Contains(string name); public void CopyTo(DataColumn[] array, int index); public int IndexOf(DataColumn column); public int IndexOf(string columnName); public void Remove(DataColumn column); public void Remove(string name); public void RemoveAt(int index); } }