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ErrorProvider::DataMember Property

Gets or sets the list within a data source to monitor.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public:
property String^ DataMember {
	String^ get ();
	void set (String^ value);
}

Property Value

Type: System::String
The string that represents a list within the data source specified by the DataSource to be monitored. Typically, this will be a DataTable.

The DataMember is a navigation string based on DataSource.

To avoid conflicts at run time that can occur when changing DataSource and DataMember, you should use BindToDataAndErrors instead of setting DataSource and DataMember individually.

The following code example shows how to use the ErrorProvider with a DataSource and DataMember to indicate a data error to the user.

private:
   void InitializeComponent()
   {

      // Standard control setup. 
      //.... 
      // You set the DataSource to a data set, and the DataMember to a table.
      errorProvider1->DataSource = dataSet1;
      errorProvider1->DataMember = dataTable1->TableName;
      errorProvider1->ContainerControl = this;
      errorProvider1->BlinkRate = 200;

      //... 
      // Since the ErrorProvider control does not have a visible component, 
      // it does not need to be added to the form. 
   }


private:
   void buttonSave_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {

      // Checks for a bad post code.
      DataTable^ CustomersTable;
      CustomersTable = dataSet1->Tables[ "Customers" ];
      System::Collections::IEnumerator^ myEnum = (CustomersTable->Rows)->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         DataRow^ row = safe_cast<DataRow^>(myEnum->Current);
         if ( Convert::ToBoolean( row[ "PostalCodeIsNull" ] ) )
         {
            row->RowError = "The Customer details contain errors";
            row->SetColumnError( "PostalCode", "Postal Code required" );
         }
      }
   }

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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