C# – How to load a dropdown list in ASP.NET and C#

asp.netc

How do I load a dropdown list in asp.net and c#?

Best Answer

You can also do it declaratively:

<asp:DropDownList runat="server" ID="yourDDL">
    <asp:ListItem Text="Add something" Value="theValue" />
</asp:DropDownList>

You can also data bind them:

yourDDL.DataSource = YourIEnumberableObject;
yourDDL.DataBind();

Edit: As mentioned in the comments, you can also add items programatically:

yourDDL.Items.Add(YourSelectListItem);

Related Solutions

C# – the difference between String and string in C#

string is an alias in C# for System.String.
So technically, there is no difference. It's like int vs. System.Int32.

As far as guidelines, it's generally recommended to use string any time you're referring to an object.

e.g.

string place = "world";

Likewise, I think it's generally recommended to use String if you need to refer specifically to the class.

e.g.

string greet = String.Format("Hello {0}!", place);

This is the style that Microsoft tends to use in their examples.

It appears that the guidance in this area may have changed, as StyleCop now enforces the use of the C# specific aliases.

C# – How to cast int to enum

From an int:

YourEnum foo = (YourEnum)yourInt;

From a string:

YourEnum foo = (YourEnum) Enum.Parse(typeof(YourEnum), yourString);

// The foo.ToString().Contains(",") check is necessary for enumerations marked with an [Flags] attribute
if (!Enum.IsDefined(typeof(YourEnum), foo) && !foo.ToString().Contains(","))
{
    throw new InvalidOperationException($"{yourString} is not an underlying value of the YourEnum enumeration.")
}

Update:

From number you can also

YourEnum foo = (YourEnum)Enum.ToObject(typeof(YourEnum) , yourInt);

Best Answer

Related Solutions

C# – the difference between String and string in C#

This is the style that Microsoft tends to use in their examples.

C# – How to cast int to enum

Related Topic