Binding a DateTime Column to a TextBox in .NET framework

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Binding a DateTime Column to a TextBox
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Developers frequently choose to use a simple text box control for date and time display and input In part this is due to the data-binding problems experienced with the DateTimePicker control in NET 11 and to the remaining problems with dealing with nulls But it can also be to simply have explicit control over the display and input values Presenting a drop-down calendar as shown in Figure 44 doesn't make a lot of sense if the control is only going to display times Unfortunately, the DateTimePicker doesn't give you the ability to disable that functionality, so you may decide to display the time in a TextBox control Another new control to consider for this scenario is the MaskedTextBox control, which lets you specify allowable patterns for the input into the text box The same basic approach applies for binding a DateTime value to a text box: you need to create the binding object with formatting enabled and add it to the DataBindings collection on the control Binding hireDateBinding = new Binding("Text", m_EmployeesBindingSource, "HireDate",true); hireDateBindingFormatString = "d"; hireDateBindingNullValue = "<unknown>" ; m_HireDateTextBoxDataBindingsAdd(hireDateBinding);
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This example explicitly creates an instance of theBinding class first, instead of using one of the overloads of theAdd method on the DataBindings collection The constructor for theBinding class has similar overloads, so you can choose whether to initialize all the relevant formatting properties inline as constructor parameters or to break them out as properties as shown in this code snippet This example constructs the Binding object with automatic formatting turned on (the formattingEnabled parameter to the constructor set to true) and then sets the FormatString property, which will be passed to the format provider that is being used for the control In the example, the NullValue property is set to a string that will be displayed in the text box if the underlying bound property or column contains a null or DBNull value Because the value being used to set the Text property on the text box is aDateTime from the data source, theDateTimeFormatInfo provider is used It supports a number of predefined and custom formatting strings as discussed earlier This code example passes a format string of d, which translates to the short date predefined format This displays the data only in the format MM/DD/YYYY in the United States, but will display it as DD/MM/YYYY in Europe You could also pass a custom string such as MM/yy, which would display the date with only two digits each for month and year Note that these formatting strings are case sensitive: MM will output a two-digit numeric month, and mm will output the minutes as two digits
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Binding a Numeric Column to a TextBox
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Setting up binding for a numeric column to a TextBox control is very similar to doing it for aDateTime column The main difference is in the formatting strings that you use to specify the output format in the text box You can again provide the format string either through the Binding constructor or by setting theFormatString property on the Binding object You can also use one of the overloadedAdd methods on the DataBindings collection The following code demonstrates the latter approach m_SalaryTextBoxDataBindingsAdd("Text", m_EmployeesBindingSource, "Salary", true, DataSourceUpdateModeOnValidation, "<not specified>", "#00");
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If you are an astute Northwind user, you know that there isn't a Salary column in the Employees table that we are using for this example I added a Salary column to the Employees table in the typed data set after it was generated by the designer, with a column type of decimal Then, in the sample code FormLoad event, I generated random salary values between 0 and 200,000 after retrieving the data from the database and injecting them into the rows: Random rand = new Random((int)DateTimeNowTicks); foreach (NorthwindDataSetEmployeesRow row in employees) { rowSalary = new Decimal(randNext(200000)); }
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The formattingEnabled parameter to the Add method set to TRue turns on automatic formatting You can use the DataSourceUpdateMode enumeration value to specify when automatic formatting occurs OnValidation, OnPropertyChanged, or Never) ( The nullValue parameter maps to the NullValue property, and it's used here to specify that if the bound data member value is or null DBNull, then the text box should display the string <not specified> Note that this null mapping works in both directions If someone enters <not specified> in the salary text box, then the value that will be written to the data source will be DBNullValue The formatString parameter is the custom format string, which in this case specifies to display the number with two decimal places You can see the end result of the code from the previous few sections in Figure 45 You can get the code itself from the ComplexTypeBinding sample application in the download I programmatically set the values of the HireDate and Salary columns to DBNull on the first record, and used theSetHireDateNull and SetSalaryNull methods exposed on the EmployeesDataRow class from the typed data set before data binding This lets you see the effect of setting the NullValue property on the bindings for those columns
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