Visual Basic

Visual Basic is an event-driven language. So, when you talk about events, we're talking about things that happen in the program which cause little events to occur (similar idea to IRQ stuff you learned hopefully in 455). An example of this could be clicking a button causing a button_click event to be generated. You write code to react to these events and guide a user through your program.

You design your form completely visually, using a set of widget tools and drawing on the form directly just like you would in a paint program or something like this. This stuff is so easy, you'll love it ... or maybe not ... but it's quick and relatively pain free.

Okay, these examples were developed by James Tam, and I've just reproduced them here. His website has all his full details on what exactly these things entail, but I'll get into them a little bit myself. If it seems that there's something missing here, be sure to check out over there for more info.

Okay, the first thing you need to do with visual basic is basically just start it up. No problem. Go:

Start --- Programs --- Microsoft Visual Basic --- You get the picture .... :)

When you load it up for the first time, Microsoft Office might churn away for a couple of minutes. This is an issue with Office 2000 and you don't need to worry about it too too much. It will only happen the once. In any case, when VB is finally loaded up, and you pick Standard Exe from the new project dialog, here's what you'll be confronted with:

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Visual Basic

HTML server controls are of two slightly different types. The HTML elements most commonly used in forms are available as individual HTML server controls, such as HtmlInputText, HtmlInputButton, HtmlTable, and so on. These HTML server controls expose their own, control-specific properties that map directly to HTML attributes. However, any HTML element can be converted to a control. In that case, the element becomes an HtmlGenericControl with base class properties such as TagName, Visible, and InnerHTML.

To set properties of HTML server controls
Get or set the property name as you would with any object. All properties are either strings or integers. The following examples illustrate this:
' Visual Basic

myAnchor.Href = "http://www.microsoft.com"
Text1.MaxLength = 20
Text1.Value = string.Format("{0:$###}", TotalCost)
Span1.InnerHTML = "You must enter a value for Email Address."

// C#
myAnchor.HRef = "http://www.microsoft.com";
Text1.MaxLength = 20;
Text1.Value = string.Format("{0:$####}", TotalCost);
Span1.InnerHtml = "You must enter a value for Email Address.";

All HTML server controls also support an Attributes collection, which gives you direct access to all the control's attributes. This is particularly useful for working with attributes that are not exposed as individual properties.

To work with control attributes directly
Use the properties and methods of a control's Attributes collection, such as Add, Remove, Clear, and Count. The Keys property returns a collection containing the names of all the attributes in the control. The following examples show various ways to use the Attributes collection:
' Visual Basic
' Adds new attribute.
Text1.Attributes.Add("bgcolor", "red")
' Removes one attribute.
Text1.Attributes.Remove("maxlength")
' Removes all attributes, clearing all properties.
Text1.Attributes.Clear()
' Creates comma-delimited list of defined attributes
Dim strTemp As String = ""
Dim key As String
For Each key In Text1.Attributes.Keys
strTemp &= Text1.Attributes(key) & ", "
Next

// C#
// Adds a new attribute.
Text1.Attributes.Add("bgcolor","red");
// Removes one attribute.
Text1.Attributes.Remove("maxlength");
// Removes all attributes, clearing all properties.
Text1.Attributes.Clear();
// Creates comma-delimited list of defined attributes
string strTemp = "";
foreach (string key in Text1.Attributes.Keys)
{
strTemp += Text1.Attributes[key] + ", ";
}

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