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.NET Framework 4
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Microsoft Visual Studio 2010/.NET Framework 4

Other versions are also available for the following:
.NET Framework Class Library
AutoCompleteStringCollection Class

Contains a collection of strings to use for the auto-complete feature on certain Windows Forms controls.

 Inheritance Hierarchy
System..::.Object
  System.Windows.Forms..::.AutoCompleteStringCollection

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)
 Syntax
Visual Basic 
Public Class AutoCompleteStringCollection _
    Implements IList, ICollection, IEnumerable
C# 
public class AutoCompleteStringCollection : IList, 
    ICollection, IEnumerable
Visual C++ 
public ref class AutoCompleteStringCollection : IList, 
    ICollection, IEnumerable
F# 
type AutoCompleteStringCollection =  
    class
        interface IList
        interface ICollection
        interface IEnumerable
    end

The AutoCompleteStringCollection type exposes the following members.

 Constructors
  NameDescription
Public methodAutoCompleteStringCollectionInitializes a new instance of the AutoCompleteStringCollection class.
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 Properties
  NameDescription
Public propertyCountGets the number of items in the AutoCompleteStringCollection .
Public propertyIsReadOnlyGets a value indicating whether the contents of the collection are read-only.
Public propertyIsSynchronizedGets a value indicating whether access to the AutoCompleteStringCollection is synchronized (thread safe).
Public propertyItemGets or sets the element at the specified index.
Public propertySyncRootGets an object that can be used to synchronize access to the AutoCompleteStringCollection.
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 Methods
  NameDescription
Public methodAddInserts a new String into the collection.
Public methodAddRangeAdds the elements of a String collection to the end.
Public methodClearRemoves all strings from the collection.
Public methodContainsIndicates whether the String exists within the collection.
Public methodCopyToCopies an array of String objects into the collection, starting at the specified position.
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetEnumeratorReturns an enumerator that iterates through the AutoCompleteStringCollection.
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIndexOfObtains the position of the specified string within the collection.
Public methodInsertInserts the string into a specific index in the collection.
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected methodOnCollectionChangedRaises the CollectionChanged event.
Public methodRemoveRemoves a string from the collection.
Public methodRemoveAtRemoves the string at the specified index.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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 Events
  NameDescription
Public eventCollectionChangedOccurs when the collection changes.
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 Extension Methods
  NameDescription
Public Extension MethodAsParallelEnables parallelization of a query. (Defined by ParallelEnumerable.)
Public Extension MethodAsQueryableConverts an IEnumerable to an IQueryable. (Defined by Queryable.)
Public Extension MethodCast<(Of <(TResult>)>)Casts the elements of an IEnumerable to the specified type. (Defined by Enumerable.)
Public Extension MethodOfType<(Of <(TResult>)>)Filters the elements of an IEnumerable based on a specified type. (Defined by Enumerable.)
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 Explicit Interface Implementations
  NameDescription
Explicit interface implemetationPrivate methodICollection..::.CopyToCopies the strings of the collection to an Array, starting at a particular Array index. For a description of this member, see ICollection..::.CopyTo.
Explicit interface implemetationPrivate methodIList..::.AddAdds a string to the collection. For a description of this member, see IList..::.Add.
Explicit interface implemetationPrivate methodIList..::.ContainsDetermines where the collection contains a specified string. For a description of this member, see IList..::.Contains.
Explicit interface implemetationPrivate methodIList..::.IndexOfDetermines the index of a specified string in the collection. For a description of this member, see IList..::.IndexOf.
Explicit interface implemetationPrivate methodIList..::.InsertInserts an item to the collection at the specified index. For a description of this member, see IList..::.Insert.
Explicit interface implemetationPrivate propertyIList..::.IsFixedSizeGets a value indicating whether the collection has a fixed size. For a description of this member, see IList..::.IsFixedSize.
Explicit interface implemetationPrivate propertyIList..::.IsReadOnlyGets a value indicating whether the collection is read-only. For a description of this member, see IList..::.IsReadOnly.
Explicit interface implemetationPrivate propertyIList..::.ItemGets the element at a specified index. For a description of this member, see IList..::.Item.
Explicit interface implemetationPrivate methodIList..::.RemoveRemoves the first occurrence of a specific string from the collection. For a description of this member, see IList..::.Remove.
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 Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
 Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
 Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
 See Also

Reference

System.Windows.Forms Namespace
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Below example explains to populate AutoCompleteStringCollection from database.      DotNetGuy121   |   Edit   |   Show History

AutoCompleteStringCollection AutoCompleteList = new AutoCompleteStringCollection();

DataTable dt = SQLUtils.ExecuteDataset(SQLCon.GetSQLConnectionString(), CommandType.Text, "Your Query").Tables[0];
string[] ItemCodes = dt
.AsEnumerable()
.Select<System.Data.DataRow, String>(x => x.Field<String>("Column Name"))
.ToArray();
AutoCompleteList.AddRange(ItemCodes);

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