protected void LoadArtistList()
{
// user friendly error handling (aka try/catch)
//use the usercontrol MessageUserControl to manage the
// error handling for the web page when control
// leaves the web page and goes to the class library
MessageUserControl.TryRun(() => {
//what goes inside the coding block?
//your code that would normally be inside the try portion of a try/catch
ArtistController sysmgr = new ArtistController();
List <SelectionList> info = sysmgr.Artists_DDLList();
//let's assume the data collection needs to be sorted
info.Sort((x, y) => x.DisplayField.CompareTo(y.DisplayField));
//setup the ddl
ArtistList.DataSource = info;
//ArtistList.DataTextField = "DisplayField";
ArtistList.DataTextField = nameof(SelectionList.DisplayField);
ArtistList.DataValueField = nameof(SelectionList.ValueField);
ArtistList.DataBind();
//setup of a prompt line
ArtistList.Items.Insert(0, new ListItem("select ...", "0"));
}, "Success title message", "the succes title and body message are optional");
}
protected void LoadArtistList()
{
ArtistController sysmgr = new ArtistController();
List <SelectionList> info = sysmgr.Artists_DDLList();
//Lets assume the data collection needs to be sorted
info.Sort((x, y) => x.DisplayField.CompareTo(y.DisplayField));
//set up the DDL
ArtistList.DataSource = info;
//ArtistList.DataTextField = "DisplayField";
ArtistList.DataTextField = nameof(SelectionList.DisplayField);
ArtistList.DataValueField = nameof(SelectionList.ValueField);
ArtistList.DataBind();
ArtistList.Items.Insert(0, new ListItem("Select ...", "0"));
}
protected void LoadArtistList()
{
ArtistController sysmgr = new ArtistController();
List <SelectionList> info = sysmgr.Artists_DDLList();
// lets assume the data collection needs to be sort
info.Sort((x, y) => x.DisplayField.CompareTo(y.DisplayField));
//setup the ddl
ArtistList.DataSource = info; //ArtistList is the DropDownList ID
//ArtistList.DataTextField = "DisplayField";
ArtistList.DataTextField = nameof(SelectionList.DisplayField); //nameof(object.prop)
ArtistList.DataValueField = nameof(SelectionList.ValueField); //nameof(object.prop)
ArtistList.DataBind(); // use to show the data in ddl. without it, data does not get in ddl
//prompt line
ArtistList.Items.Insert(0, new ListItem("select...", "0"));
}
protected void LoadArtistList()
{
ArtistController sysmgr = new ArtistController();
List <SelectionList> info = sysmgr.Artists_DDLList();
//lets assume data collection needs to be sorted (ascending order)
// for x and y, do the following...
//lambda (=>) will supply the delegate (on the right side of =>)
//compare x display field to y display field
info.Sort((x, y) => x.DisplayField.CompareTo(y.DisplayField));
//setup the ddl
ArtistList.DataSource = info;
ArtistList.DataTextField = nameof(SelectionList.DisplayField);
ArtistList.DataValueField = nameof(SelectionList.ValueField);
ArtistList.DataBind();
//setup of a prompt line, at position 0...
ArtistList.Items.Insert(0, new ListItem("Please select...", "0"));
}
protected void LoadArtistList()
{
ArtistController sysmgr = new ArtistController();
List <SelectionList> info = sysmgr.Artists_DDLList();
//let's assume the data collection needs to be sorted
info.Sort((x, y) => x.DisplayField.CompareTo(y.DisplayField));
//setup the ddl
ArtistList.DataSource = info;
//OLD WAY
//ArtistList.DataTextField = "Displayfield";
//NEW WAY
ArtistList.DataTextField = nameof(SelectionList.DisplayField);
ArtistList.DataValueField = nameof(SelectionList.ValueField);
ArtistList.DataBind();
//prompt line -- a more "complete and proper" way of inserting a prompt
ArtistList.Items.Insert(0, new ListItem("Select...", "0"));
}