Select multiple value in dropdownlist using asp net and c sharp

ASP.NET is a powerful programming language that allows developers to create dynamic web applications. One common task in web development is to create a dropdown list that allows users to select multiple . In this article, we will explore how to achieve this ASP.NET and C#.

To begin, let's take a look at the ASP.NET code that creates a dropdown list:



    
    
    
    

In the above code, we have created a dropdown list with the ID “ddlOptions”. The “Multiple” attribute is set to “true”, which allows users to select multiple values.

Now, let's move on to the C# code that retrieves the selected values from the dropdown list:


protected void btnSubmit_Click( sender, EventArgs e)
{
    foreach (ListItem item in ddlOptions.)
    {
        if (item.Selected)
        {
            // Do something with the selected value
            string selectedValue = item.Value;
            // ...
        }
    }
}

In the above code, we have a button with the ID “btnSubmit” that triggers the click event. Inside the event handler, we iterate each item in the dropdown list using a foreach loop. We if the item is selected using the “Selected” property. If it is selected, we can retrieve the value using the “Value” property and perform any necessary actions.

Example:

Let's say we want to display the selected values in a label on the web page. We can modify the C# code as follows:


protected void btnSubmit_Click(object sender, EventArgs e)
{
    string selectedValues = "";
    foreach (ListItem item in ddlOptions.Items)
    {
        if (item.Selected)
        {
            selectedValues += item.Value + ", ";
        }
    }
    lblSelectedValues.Text = selectedValues.TrimEnd(',', ' ');
}

In the above code, we have added a label with the ID “lblSelectedValues” to the web page. Inside the event handler, we concatenate the selected values into a string variable “selectedValues”. We then assign this string to the Text property of the label, removing the trailing comma and space using the TrimEnd method.

Now, when the user selects multiple values from the dropdown list and the submit button, the selected values will be displayed in the label.

In conclusion, multiple values in a dropdown list using ASP.NET and C# is a straightforward process. By setting the “Multiple” attribute to “true” in the ASP.NET code and iterating through the items in the C# code, we can easily retrieve and manipulate the selected values.

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