How to return DropDownList selections dynamically in ASP.NET?
- by salvationishere
This is probably a simple question but I am developing a web app in C# with DropDownList. Currently it is working for just one DropDownList. But now that I modified the code so that number of DropDownLists that should appear is dynamic, it gives me error;
"The name 'ddl' does not exist in the
current context."
The reason for this error is that there a multiple instances of 'ddl' = number of counters. So how do I instead return more than one 'ddl'? Like what return type should this method have instead? And how do I return these values?
Reason I need it dynamic is I need to create one DropDownList for each column in whatever Adventureworks table they select.
private DropDownList CreateDropDownLists()
{
for (int counter = 0; counter < NumberOfControls; counter++)
{
DropDownList ddl = new DropDownList();
SqlDataReader dr2 = ADONET_methods.DisplayTableColumns(targettable);
ddl.ID = "DropDownListID" + (counter + 1).ToString();
int NumControls = targettable.Length;
DataTable dt = new DataTable();
dt.Load(dr2);
ddl.DataValueField = "COLUMN_NAME";
ddl.DataTextField = "COLUMN_NAME";
ddl.DataSource = dt;
ddl.ID = "DropDownListID 1";
ddl.SelectedIndexChanged += new EventHandler(ddlList_SelectedIndexChanged);
ddl.DataBind();
ddl.AutoPostBack = true;
ddl.EnableViewState = true; //Preserves View State info on Postbacks
//ddlList.Style["position"] = "absolute";
//ddl.Style["top"] = 80 + "px";
//ddl.Style["left"] = 0 + "px";
dr2.Close();
}
return ddl;
}
