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Message: [QUOTE="Andrus, post: 10693522"] I'm trying to compile myGeneration PropertyCollectionAll.cs file with VCS Express 2005 bot got error Error 1 The type or namespace name 'Collection' could not be found (are you missing a using directive or an assembly reference?) PropertyCollectionAll.cs 17 39 I looked to .NET 2 help and found that Collection class is included in mscorlib so it doen't need assembly reference. How to fix this error ? Whole file which causes this error is: using System; using System.Xml; using System.Collections; using System.Data; using System.Data.OleDb; namespace MyMeta { public class PropertyCollectionAll : Collection, IPropertyCollection, IEnumerable, IEnumerator, ICollection { public PropertyCollectionAll() { } internal void Load(IPropertyCollection local, IPropertyCollection global) { this._local = local; this._global = global; } #region IPropertyCollection //[System.Runtime.InteropServices.DispId(0)] public IProperty this[string key] { get { if(this._local.ContainsKey(key)) { return this._local[key]; } else if(this._global.ContainsKey(key)) { return this._global[key]; } return null; } } /// <summary> /// This method will either add or update a key value pair. If the key already exists in the collection the value will be updated. /// If this key doesn't exist the key/value pair will be added. If only want to update, and not add new items, use <see cref="ContainsKey"/> to determine if the key already exists. /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <returns></returns> public IProperty AddKeyValue(string key, string value) { throw new NotImplementedException("Cannot call AddKeyValue on this collection"); } /// <summary> /// Removes a key/value pair from the collection, no error is thrown if the key doesn't exist. /// </summary> /// <param name="key">The key of the desired key/value pair</param> public void RemoveKey(string key) { throw new NotImplementedException("Cannot call AddKeyValue on this collection"); } /// <summary> /// Use ContainsKey to determine if a key exists in the collection. /// </summary> /// <param name="key">The key of the desired key/value pair</param> /// <returns>True if the key exists, False if not</returns> public bool ContainsKey(string key) { if(this._local.ContainsKey(key)) { return true; } else if(this._global.ContainsKey(key)) { return true; } return false; } /// <summary> /// Removes all key/value pairs from the collection. /// </summary> new public void Clear() { throw new NotImplementedException("Cannot call AddKeyValue on this collection"); } #endregion #region IEnumerable Members public IEnumerator GetEnumerator() { Reset(); return (this as IEnumerator); } #endregion #region IEnumerator Members public void Reset() { useLocalEnum = true; wereDone = false; _localEnumerator = this._local.GetEnumerator(); _globalEnumerator = this._global.GetEnumerator(); } public object Current { get { IProperty prop = null; if(useLocalEnum) { prop = (IProperty)_localEnumerator.Current; } else { prop = (IProperty)_globalEnumerator.Current; } return prop; } } public bool MoveNext() { if(this.useLocalEnum) { if(_localEnumerator.MoveNext()) return true; } if(!wereDone) { this.useLocalEnum = false; while(true) { if(_globalEnumerator.MoveNext()) { IProperty prop = (IProperty)_globalEnumerator.Current; if(!this._local.ContainsKey(prop.Key)) { return true; } } else { break; } } wereDone = true; } return false; } #endregion #region ICollection Members public new bool IsSynchronized { get { // TODO: Add Databases.IsSynchronized getter implementation return false; } } public new void CopyTo(Array array, int index) { // TODO: Add Databases.CopyTo implementation } public new object SyncRoot { get { // TODO: Add Databases.SyncRoot getter implementation return null; } } #endregion private IPropertyCollection _local; private IPropertyCollection _global; bool useLocalEnum = true; bool wereDone = false; private IEnumerator _localEnumerator = null; private IEnumerator _globalEnumerator = null; } } [/QUOTE]

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