DataColumnCollection.CanRemove Method (DataColumn)


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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


Type: System.Data.DataColumn

A DataColumn in the collection.

Return Value

Type: System.Boolean

true if the column can be removed. false if,

  • The column parameter is null.

  • The column does not belong to this collection.

  • The column is part of a relationship.

  • 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]))

.NET Framework
Available since 1.1
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