DataRow.IsNull Method (String)

 
System_CAPS_noteNote

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Gets a value that indicates whether the named column contains a null value.

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

member IsNull : 
        columnName:string -> bool

Parameters

columnName
Type: System.String

The name of the column.

Return Value

Type: System.Boolean

true if the column contains a null value; otherwise, false.

The following example changes the value of a column to a null value, and then uses the IsNull method to determine whether the value is null.

 Private Sub IsValNull()
    ' Assuming the DataGrid is bound to a DataTable.
    Dim table As DataTable = CType(DataGrid1.DataSource, DataTable)
    Dim row As DataRow = table.Rows(datagrid1.CurrentCell.RowNumber)
    row.BeginEdit
    row("FirstName") = System.DBNull.Value
    row.EndEdit
    row.AcceptChanges
    Console.WriteLine(row.IsNull("FirstName"))
End Sub

.NET Framework
Available since 1.1
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