Windows Forms data binding integrates with the Windows Forms ErrorProvider control.  When using the ErrorProvider and if a simple data binding operation fails, the ErrorProvider control will provide visual feedback (an error icon) on the user interface element that experienced the failure.  The ErrorProvider looks for exceptions that occur during binding and will additionally report IDataErrorInfo information on data sources that support this interface.

/*******************************************************************
* Setup (using the Visual Studio Form designer):
* 
*  Add 2 TextBoxes to the Form (textBox1 and textBox2)
*  Add an ErrorProvider to the Form (errorProvider1)
*  Add the code below to the Form.Load event
******************************************************************/

/*******************************************************************
* Data Source setup:
* 
* Create a Table named Numbers and add 3 columns
*  ID:     int
*  Name:   string
*  Cost:   Decimal
******************************************************************/

DataTable _dt;

_dt = new DataTable("Numbers");

_dt.Columns.Add("ID", typeof(int));
_dt.Columns.Add("Name", typeof(string));
_dt.Columns.Add("Cost", typeof(decimal));

_dt.Rows.Add(0, "Zero", 10.0M);
_dt.Rows.Add(1, "One", 11.1M);
_dt.Rows.Add(2, "Two", 12.2M);
        
/*******************************************************************
* Set up the ErrorProvider:
* 
* Bind it to the same data source used by the TextBoxes.
******************************************************************/

this.errorProvider1.DataSource = _dt;

/*******************************************************************
* Bind TextBox.Text (string) to Numbers.ID (integer)
* The binding runtime will handle type conversion between integer
* and string
******************************************************************/
        
this.textBox1.DataBindings.Add("Text", _dt, "ID", true);

/*******************************************************************
* Bind TextBox.Text (string) to Numbers.Cost
* The binding runtime will display the value as Currency ($value.00)
*
* Note that this manually creates and adds the Binding to the
* control’s DataBinding collection rather than using the
* DataBindings.Add overload.
******************************************************************/

Binding cb = new Binding("Text", _dt, "Cost", true);

/* .NET Framework Currency format string */
cb.FormatString = "c";

/* Add the binding to the Textbox */
this.textBox2.DataBindings.Add(cb);