What Is Meant by a Web Server Controls Explain Any Two Controls With Example?

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Scott Campbell

Web Server Controls play a crucial role in web development as they allow developers to create interactive and dynamic web pages. These controls are server-side components that are used to add functionality and interactivity to web forms. In this article, we will explore the concept of Web Server Controls and explain two commonly used controls with examples.

What Are Web Server Controls?

Web Server Controls, also known as ASP.NET controls, are elements that are used in web forms to provide a user interface and interact with users. These controls are created on the server side and rendered as HTML when the page is requested by the client’s browser. They offer a wide range of functionality, including input validation, data binding, event handling, and more.

Example 1: TextBox Control

One of the most basic yet frequently used Web Server Controls is the TextBox control. As the name suggests, it allows users to input textual information. Let’s consider an example where we want users to enter their names in a text box.

Step 1: Adding the TextBox Control

To add a TextBox control to your web form, you need to place it inside a form element. Here’s an example:

<form runat="server">
    <asp:TextBox ID="txtName" runat="server"></asp:TextBox>
</form>

In this code snippet, we have added a TextBox control with an ID of “txtName”. The “runat” attribute specifies that this control is server-side.

Step 2: Retrieving User Input

Once we have added the TextBox control, we can easily retrieve the user’s input using server-side code. For example:

protected void btnSubmit_Click(object sender, EventArgs e)
{
    string name = txtName.Text;
    // Perform further processing with the user's name
}

In this code snippet, we have an event handler for a button click event. Inside the event handler, we access the “Text” property of the TextBox control to retrieve the user’s input.

Example 2: DropDownList Control

Another commonly used Web Server Control is the DropDownList control. It allows users to select an option from a pre-defined list of items. Let’s say we want users to select their favorite programming language from a dropdown list.

Step 1: Adding the DropDownList Control

To add a DropDownList control to your web form, you can use the following code:

<asp:DropDownList ID="ddlLanguage" runat="server">
    <asp:ListItem Text="Java" Value="java"></asp:ListItem>
    <asp:ListItem Text="C#" Value="csharp"></asp:ListItem>
    <asp:ListItem Text="Python" Value="python"></asp:ListItem>
</asp:DropDownList>

In this code snippet, we have added a DropDownList control with an ID of “ddlLanguage”. The list items inside the control represent different programming languages.

Step 2: Retrieving Selected Value

To retrieve the selected value from the DropDownList control, we can use server-side code. For example:

protected void btnSubmit_Click(object sender, EventArgs e)
{
    string selectedLanguage = ddlLanguage.SelectedValue;
    // Perform further processing with the selected language
}

In this code snippet, we have an event handler for a button click event. Inside the event handler, we access the “SelectedValue” property of the DropDownList control to retrieve the selected language.

Conclusion

Web Server Controls are powerful tools that enable developers to create interactive web forms easily. In this article, we explained the concept of Web Server Controls and provided examples of two commonly used controls – TextBox and DropDownList.

These controls allow users to input data and make selections, respectively. By incorporating these controls into your web forms, you can enhance user experience and create dynamic web applications.

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