Hi Bonnie,

I was wondering if you could make any suggestions on why my data set table column bound to the check box does not get updated after I click on the check box. The check box visibly changes to unchecked (or if it was unchecked to checked). But when I in code test the value in the table column does not change.

I am using your checkbox subclass and bound it to the column of Boolean type (the type in SQL Server is BIT).

Interesting that if I use a standard checkbox class and bind it using syntax

this.chkStatus.DataBindings.Add("Checked", bindingSource1, "VendorStatus");

then the value in the table column changes. But I have other issues with the standard checkbox class. So I prefer to use your version of the class code (as shown below). And I bind the column then as you suggested:

this.MyCheckBox.DataBind(MyTable, "MyYNColumn");

But, as I said, this does not update the data set/data table/column. Please let me know if you have any suggestions.

>Hi Dmitry,
>
>Do you have a checkbox subclass? You'll need one. In fact, I have two checkboxes, one for binding to normal bool values and one for binding to string values. Your code might have to be slightly different, since you're utilizing a BindingSource and my examples below bind directly to the DataTable rather than to a BindingSource (you could simply add another overloaded DataBind() method):
>
>This CheckBox binds directly to your DataColumn rather than an intermediary property (which can be done too, but takes more code IMHO). This class can be extended to be able to used with other strings, such as T/F, but I’ll leave that as an exercise for the reader:
>
>

>public class BBCheckBoxString : System.Windows.Forms.CheckBox
>{
>	protected Binding oBinding = null;
>
>	public virtual void DataBind(System.Data.DataTable Data, string Column)
>	{
>		this.Checked = false;
>		this.oBinding = new Binding("Checked", Data, Column);
>
>		this.oBinding.Format += new ConvertEventHandler(this.FormatHandler);
>		this.oBinding.Parse += new ConvertEventHandler(this.ParseHandler);
>
>		this.DataBindings.Add(this.oBinding);
>	}
>	protected override void FormatHandler(object sender, ConvertEventArgs e)
>	{
>		if (e.Value.ToString() == "Y")
>			e.Value = true;
>		else
>			e.Value = false;
>	}
>	protected override void ParseHandler(object sender, ConvertEventArgs e)
>	{
>		if ((bool)e.Value == true)
>			e.Value = "Y";
>		else
>			e.Value = "N";
>	}
>}
>

>
>Then, on your Form or control, to databind that Checkbox, you’d do this:
>
>

>this.MyCheckBox.DataBind(MyTable, "MyYNColumn");
>

>
>Now, a regular CheckBox:
>
>

>public class BBCheckBox : System.Windows.Forms.CheckBox
>{
>	#region Declarations
>	protected Binding oBinding = null;
>	protected CurrencyManager oCurrency = null;
>	protected DataTable m_BoundTable = null;
>	protected string m_BoundColumn = "";
>	protected bool m_ReadOnly = false;
>	#endregion
>
>	#region Methods
>	public virtual void DataBind(System.Data.DataTable Data, string column)
>	{
>		this.Checked = false;
>
>		this.m_BoundTable = Data;
>		this.m_BoundColumn = column;
>		this.oBinding = new Binding("Checked", Data, column);
>
>		this.oBinding.Format += new ConvertEventHandler(this.FormatHandler);
>		this.oBinding.Parse += new ConvertEventHandler(this.ParseHandler);
>
>		this.DataBindings.Add(this.oBinding);
>
>		if (this.BindingContext != null)
>		{
>			this.oCurrency = (CurrencyManager)this.BindingContext[this.oBinding.DataSource];
>			this.oCurrency.PositionChanged += new EventHandler(this.PositionChangedHandler);
>		}
>
>		this.SetEOF();
>	}
>	protected virtual void SetEOF()
>	{
>		if (this.oCurrency == null)
>			return;
>
>		if (this.oCurrency.Position < 0)
>			this.Enabled = false;
>		else 
>			this.Enabled = !this.ReadOnly;
>	}
>	#endregion
>
>	#region Events
>	protected virtual void FormatHandler(object sender, ConvertEventArgs e)
>	{
>		if (e.Value == System.DBNull.Value)
>			e.Value = false;
>	}
>	protected virtual void ParseHandler(object sender, ConvertEventArgs e)
>	{
>	}
>	protected virtual void PositionChangedHandler(object sender, System.EventArgs e)
>	{
>		this.SetEOF();
>	}
>	
>	#endregion
>
>	#region Properties
>	[DefaultValue(false)]
>	public bool ReadOnly
>	{
>		get { return this.m_ReadOnly; }
>		set 
>		{ 
>			this.m_ReadOnly = value; 
>			this.Enabled = !value;
>		}
>	}
>
>	#endregion
>}
>

>
>HTH,
>~~Bonnie
>
>
>>Hi,
>>
>>I have a column in a table of type nchar(1). The value in this column is "A" or "I". I want to bind this column to a check box and show in the caption of the check box "Active" (for 'A') and "Inactive" for 'I'
>>
>>I tried the following binding code but get error:
>>
>>

>>this.chkStatus.DataBindings.Add("Checked", bindingSource1, "Status=='A'");
>>

>>
>>What am I doing wrong? TIA.