How Do I Execute Sql Query In Web Application Using Linq Where Query Has As Clause

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C#

LINQ

SQL-Server-2008R2

I am using linq-to-sql in order to perform my data manipulation operation. I wanted to execute sql query in web application using Linq. I have done this:

using (DBUserDataContext db = new DBUserDataContext())
{
   str = @"
        select distinct 
            ltrim(rtrim(UserID)) as userText,
            ltrim(rtrim(UserID)) as userValue 
        from Users order by userID asc";
       
    var result = db.ExecuteQuery<User>(strSQL);
    result.ToList();
}

Here as userText and as userValue are used because this is used to bind value in combobox as shown below"

DataTextField = "userText"
DataValueField = "userValue"

In doing so, i am getting error " The required column 'UserID' does not exist in the results." However, when i omit as userText, the error is not coming. But my requirement to show in combo box will not work if it is not done.
Any help?
Thanks in advance..