DataTable.Columns Property

Reference

Definition

Namespace:: System.Data

Assemblies:: netstandard.dll, System.Data.Common.dll

Assembly:: System.Data.Common.dll

Assembly:: System.Data.dll

Assembly:: netstandard.dll

Source:: DataTable.cs

Source:: DataTable.cs

Source:: DataTable.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets the collection of columns that belong to this table.

public:
 property System::Data::DataColumnCollection ^ Columns { System::Data::DataColumnCollection ^ get(); };

public System.Data.DataColumnCollection Columns { get; }

[System.Data.DataSysDescription("DataTableColumnsDescr")]
public System.Data.DataColumnCollection Columns { get; }

member this.Columns : System.Data.DataColumnCollection

[<System.Data.DataSysDescription("DataTableColumnsDescr")>]
member this.Columns : System.Data.DataColumnCollection

Public ReadOnly Property Columns As DataColumnCollection

Property Value

DataColumnCollection

A DataColumnCollection that contains the collection of DataColumn objects for the table. An empty collection is returned if no DataColumn objects exist.

Attributes: DataSysDescriptionAttribute

Examples

The following example prints each value of each row in a table using the Columns property.

private void PrintValues(DataTable table)
{
    foreach(DataRow row in table.Rows)
    {
        foreach(DataColumn column in table.Columns)
        {
            Console.WriteLine(row[column]);
        }
    }
}

Private Sub PrintValues(ByVal table As DataTable)
    Dim row As DataRow
    Dim column As DataColumn
    For Each row in table.Rows
       For Each column In table.Columns
          Console.WriteLine(row(column))
       Next
    Next
End Sub

Remarks

The DataColumnCollection determines the schema of a table by defining the data type of each column.

Applies to

Product	Versions
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1

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