DataRow::IsNull Method (String^)
.NET Framework (current version)
Gets a value that indicates whether the named column contains a null value.
Assembly: System.Data (in System.Data.dll)
Parameters
- columnName
-
Type:
System::String^
The name of the column.
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
Available since 1.1
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