CurrencyManager Class

The CurrencyManager derives from the BindingManagerBase class. Use the BindingContext to return either a CurrencyManager or a PropertyManager. The actual object returned depends on the data source and data member passed to the Item property of the BindingContext. If the data source is an object that can return only a single property (instead of a list of objects), the type will be a PropertyManager. For example, if you specify a TextBox as the data source, a PropertyManager will be returned. If, on the other hand, the data source is an object that implements the IList, IListSource, or IBindingList interface, a CurrencyManager will be returned.

The Current property returns the current item in the underlying list. To change the current item, set the Position property to a new value. The value must be greater than 0 and must be less than the value of the Count property.

If the underlying data source implements the IBindingList interface, and the AllowNew property is set to true, you can use the AddNew method.

The following code example binds a TextBox control to a column in a DataTable, gets the CurrencyManager for the binding, and sets its position.

private CurrencyManager myCurrencyManager;

 private void BindControl(DataTable myTable){
    // Bind a TextBox control to a DataTable column in a DataSet.
    textBox1.DataBindings.Add("Text", myTable, "CompanyName");
    // Specify the CurrencyManager for the DataTable.
    myCurrencyManager = (CurrencyManager)this.BindingContext[myTable];
    // Set the initial Position of the control.
    myCurrencyManager.Position = 0;
 }

 private void MoveNext(CurrencyManager myCurrencyManager){
    if (myCurrencyManager.Position == myCurrencyManager.Count - 1){
       MessageBox.Show("You're at end of the records");
    }
    else{
      myCurrencyManager.Position += 1;
    }
 }

 private void MoveFirst(CurrencyManager myCurrencyManager){
    myCurrencyManager.Position = 0;
 }

 private void MovePrevious(CurrencyManager myCurrencyManager ){
    if(myCurrencyManager.Position == 0) {
       MessageBox.Show("You're at the beginning of the records.");
    }   
    else{
       myCurrencyManager.Position -= 1;
    }
 }

 private void MoveLast(CurrencyManager myCurrencyManager){
    myCurrencyManager.Position = myCurrencyManager.Count - 1;
 }

.NET Framework

.NET Framework Client Profile

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference