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DataColumnCollection.CanRemove Method

Checks whether a specific column can be removed from the collection.

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

public bool CanRemove(
	DataColumn column
)

Parameters

column
Type: System.Data.DataColumn

A DataColumn in the collection.

Return Value

Type: System.Boolean
true if the column can be removed; otherwise, false.

ExceptionCondition
ArgumentNullException

The column parameter is null.

ArgumentException

The column does not belong to this collection.

-Or-

The column is part of a relationship.

-Or-

Another column's expression depends on this column.

The CanRemove method performs several checks before returning a true or false result. This includes the following: whether the column exists, belongs to the table, or is involved in a constraint or relation.

Use the CanRemove method before you try to remove any column from a collection. You can also use the Contains method to determine whether a particular column exists before you try to remove it.

The following example first uses the Contains method to determine whether a particular column is found in the collection. If found, the CanRemove method tests whether the column can be removed. If so, the column is removed with the Remove method.

private void RemoveColumn(string columnName, DataTable table)
{
    DataColumnCollection columns = table.Columns;
    if (columns.Contains(columnName))
        if (columns.CanRemove(columns[columnName]))
            columns.Remove(columnName);
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0
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