How to bind dropdownlist without repetations of values in windows application using entity framework

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I doing following code....but i get duplicates values in dropdownlist from my database....i dont want it ..i need only distinct value in dropdownlist....thank u....

var classname = sms.createClasses.ToList() ;

rddlclass.DisplayMember= "Classname";
rddlclass.ValueMember = "ClassId";
rddlclass.DataSource = classname;

Posted 15-Jan-15 1:15am

Member 11227519

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DamithSL · Answer 1 · 2015-01-15T01:38:00

Solution 1

change your LINQ statement as below

C#

var classname = sms.createClasses.GroupBy(i=>i.ClassId)
                   .Select(g=>new{Classname= g.First().Classname, ClassId =g.Key})
                   .ToList();
rddlclass.DisplayMember= "Classname";
rddlclass.ValueMember = "ClassId";
rddlclass.DataSource = classname;

Posted 15-Jan-15 1:38am

DamithSL

Updated 15-Jan-15 20:08pm

v3

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Member 11227519 16-Jan-15 0:58am

It does not work properly.....I get empty dropdownlist..thanks for rply....