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ConstraintCollection.Contains Method

Indicates whether the Constraint object specified by name exists in the collection.

Namespace: System.Data
Assembly: System.Data (in system.data.dll)

public bool Contains (
	string name
)
public boolean Contains (
	String name
)
public function Contains (
	name : String
) : boolean

Parameters

name

The ConstraintName of the constraint.

Return Value

true if the collection contains the specified constraint; otherwise, false.

Use the Contains method to determine whether the specified Constraint exists before trying to remove it from the collection. You can also use the CanRemove method to determine whether a Constraint can be removed.

The following example determines whether the specified Constraint exists in the ConstraintCollection before its deletion.

public static void RemoveConstraint(
    ConstraintCollection constraints, Constraint constraint)
{
    try
    {
        if(constraints.Contains(constraint.ConstraintName)) 
        {
            if(constraints.CanRemove(constraint)) 
            {
                constraints.Remove(constraint.ConstraintName);
            
        
    
    catch(Exception e) 
    {
        // Process exception and return.
        Console.WriteLine("Exception of type {0 occurred.", 
            e.GetType());
    


Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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