How to create a search bar without casesensitive

Question

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i have create a search list which shows the student details i need to find the student name with both upper case and lower case

Eg
student 1 name = arun
student 2 name = Aravid

if i enter the letter (a) in searchbar both arun and aravid should to be displayed

And i need to avoid the same name repeatation

If any one can correct my code please help me to figure it out

What I have tried:

private void search_box_TextChanged_1(object sender, TextChangedEventArgs e)
     {

         List<StudentItem> student= new List<StudentItem>();
         var prefix = search_box.Text;


         bool found = false;

         List<StudentItem> searchlist = DataAccess.getallstudent(empdetails);

         for (int i = 0; i < searchlist.Count; i++)
         {
             foreach (StudentItem item in searchlist)
             {
                 if (item.LastName.StartsWith(prefix))
                 {
                     found = true;


                     var eL_item = new StudentItem();
                     eL_item.FirstName = item.FirstName;
                     eL_item.LastName = item.LastName;
                     eL_item.TImageName = item.TImageName;

                     student.Add(eL_item);


                     studentlist.ItemsSource = empylast;

                 }


             }

         }

     }

Posted 6-Dec-22 2:39am

Ailiseu Brigitta

Updated 6-Dec-22 2:58am

v2

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PIEBALDconsult 6-Dec-22 10:57am

As Richard said, or use Regular Expressions.

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Richard Deeming · Accepted Answer · 2022-12-06T02:58:00

Based on that code:

C#

List<StudentItem> searchlist = DataAccess.getallstudent(empdetails);
if (!string.IsNullOrEmpty(prefix))
{
    for (int i = searchlist.Count - 1; i >= 0; i--)
    {
        StudenItem item = searchlist[i];
        if (!item.LastName.StartsWith(prefix, StringComparison.CurrentCultureIgnoreCase))
        {
            searchlist.RemoveAt(i);
        }
    }
}

studentlist.ItemsSource = searchlist;

However, as I said last time you posted this question[^], it would be more efficient to pass the filter to the getallstudent method, and perform the filtering in the database. The only reason we can't tell you how to do that is that you haven't shown us the query you're using, nor described the structure of your tables.