Visual C#, Autosuggest Combobox

Set the AutoCompleteMode property of the ComboBox to true.

And set the AutoCompleteCustomSource property as detailed in the following link

http://social.msdn.microsoft.com/Forums/en-US/winforms/thread/d7672f50-a620-4b5c-acc8-7ce7c61b04e9

hi ArunVashist,

                         For Visual C#, Autosuggest Combobox  follow these below links.

http://www.codeproject.com/KB/cpp/AutoCompleteComboBox.aspx

http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/autocompleteclientside/defaultcs.aspx

http://www.freevbcode.com/ShowCode.asp?ID=7007

http://www.telerik.com/community/forums/aspnet-ajax/combobox/auto-complete-combo-box-prefix-length.aspx

Hi Cute Bug,

As suggested I am using following code in "onTextChanged" event of combox box but I am getting the  error "Attempted to read or write protected memory. This is often an indication that other memory is corrupt".

following is the code.

 private void cbMedicineName_TextChanged(object sender, EventArgs e)
        {
            string QText;
            if (cbMedicineName.Text == "" || cbMedicineName.Text.Length < 2)
            {
                QText = "Do not load";
            }
            else
            {
                QText = cbMedicineName.Text;
            }
           
            OleDbDataReader Drugs = objPatient.GetDrugsList(QText);
            DataSet temp = new DataSet();
            temp.Load(Drugs, LoadOption.OverwriteChanges, "DrugsList");
               
           
            cbMedicineName.AutoCompleteMode = AutoCompleteMode.Suggest;
            cbMedicineName.AutoCompleteSource = AutoCompleteSource.CustomSource;
            cbMedicineName.AutoCompleteCustomSource.Clear();          
               
            foreach (DataRow dr in temp.Tables["DrugsList"].Rows)
            {
               cbMedicineName.AutoCompleteCustomSource.Add(dr["DrugName"].ToString());
            }
           
           
        }

HI Tapan,

I need a combobox with autosuggest feature which updated the items in combobox from database according to text input. The examples you sent are for autocomplete which just search the existing items in combobox.

Thanks,

You can do it this way

AutoCompleteStringCollection acsc = new AutoCompleteStringCollection();
 
foreach (DataRow dr in temp.Tables["DrugsList"].Rows)
{
   acsc.Add(dr["DrugName"].ToString());
}
 
cbMedicineName.AutoCompleteCustomSource = acsc;
cbMedicineName.AutoCompleteMode = AutoCompleteMode.Suggest;
cbMedicineName.AutoCompleteSource = AutoCompleteSource.CustomSource;

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Hi Cute bug,

Actually the suggested method works for the first time but when on "KeyPress"  or "TextChanged" event I requery the database and try to refresh items of AutoCompleteSoure.CustomSource I get the error "Attempted to read or write protected memory. This is often an indication that other memory is corrupt".

it would be better if you send me some working sample code.

thanks,

I think you do not have to requery in the database each time you do a key press.

Instead during the creation of the combobox, set the autocompletecustom source like the code given previously.

AutoComplete will handle the rest when you do a keypress...

Hi Cute Bug,

Actually the item count is more then 200k, and it take hell lot of time loading these values into list, so I want only to add required items in combobox. so requery and rebinding become necessary, kindly guide if any other way out is there.

thanks,