If required, Windows Forms will perform type conversion as part of the binding process.  For example, if an integer property on a business object (e.g. Customer.ID) is bound to a string property on a Control (e.g. TextBox.Text) the data binding runtime will convert the integer value to/from the string value.  Windows Forms uses TypeConverters, IFormattable and IConvertible to perform the type conversion.

/*******************************************************************
* Setup (using the Visual Studio Form designer):
* 
*  Add a TextBox to the Form (textBox1)
*  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
******************************************************************/

/*******************************************************************
* A DataTable is an ADO.NET list type that represents a relational
* table.
******************************************************************/

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);

/*******************************************************************
* 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);