Incremental Search in CombodBox

I bind combobox through dattable.

how can i add incremental search features in combobox..

Thanks
LVL 16
Kalpesh ChhatralaSoftware ConsultantAsked:
Who is Participating?
 
Shahan AyyubConnect With a Mentor Senior Software Engineer - iOSCommented:
Hi!

On every key press the combo box extracts the items that best fits the current text of the combobox within its collection(contains all record from which we are going to filter). Is this not fulfill your requirement ???

It is equivalent to filter record(s) or search record(s) from collection.

BTW Dropdownlist is a web control while your question refers "ComboBox". there are some properties you will not find in dropdown list as in combobox.


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starlite551Commented:
What Exactly are you trying to achieve can you elaborate on the question..?
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Kalpesh ChhatralaSoftware ConsultantAuthor Commented:
incremental search means result will be filter on each and every keypress.
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starlite551Commented:
If u need Auto Suggest option and Auto Complete in your ComboBox Control then you can add it using the following code :

For AutoComplete in All Urls that are present in the History..
 Try this one :
comboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
comboBox1.AutoCompleteSource = AutoCompleteSource.AllUrl;

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Kalpesh ChhatralaSoftware ConsultantAuthor Commented:
Thanks for reply.

i want to search in binded data table not from auto complete history

Second  thing i want to use combobox  in Desktop Application.
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starlite551Commented:
I have a method written in C# for you which returns the results of a search query in a DataSet Object then you can use the returned DataSet object to bind some other control like a DataGridView Control or use DataSet to display all the values of various rows in different TextBoxes So heres the method :

public DataSet GetSearchResults(string columnName,string tableName,string searchString,string connectionString)
{
      string cmd = "SELECT * FROM "+tableName+" WHERE "+columnName+" Like %"+searchString+"%";
      DataSet dsResult;
      using(SqlConnection cn = new SqlConnection(connectionString))
      {
            cn.Open();
            using(SqlCommand cm = new SqlCommand(cmd,cn))
            {
                 SqlDataAdapter da = new SqlDataAdapter(cm);
                 dsResult = new DataSet();
                 da.Fill(dsResult);                
            } 
      }   
      return dsResult;  
}

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You have to use this method in the TextChanged Event of the ComboBox Control...
Like so..

 
DataSet dsSearchRec;
private void comboBox1_TextChanged(object sender, EventArgs e)
{
      dsSearchRec = GetSearchResults("Employee_Name","Employee","Jhon",@"Data Source=.\SQLEXPRESS;Initial Catalog=EmployeeDB;Integrated Security=true;");
      dataGridView1.DataSource = dsSearchRec;
}

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starlite551Commented:
I am sorry I wrote hard coded value of "Jhon" as a searchString Parameter for the method in the TextChanged Event of the ComboBox.. Actually the code should have been this way :

DataSet dsSearchRec;
private void comboBox1_TextChanged(object sender, EventArgs e)
{
      dsSearchRec = GetSearchResults("Employee_Name","Employee",comboBox1.Text,@"Data Source=.\SQLEXPRESS;Initial Catalog=EmployeeDB;Integrated Security=true;");
      dataGridView1.DataSource = dsSearchRec;
}

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...In the place of "Jhon" I am using the value from comboBox1's Text property..
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Kalpesh ChhatralaSoftware ConsultantAuthor Commented:
each and every key press get data from data table it is not feasible.

any other solution ?
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starlite551Commented:
So you need data only when the key is pressed for the first time...??
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Kalpesh ChhatralaSoftware ConsultantAuthor Commented:
first time focus on combo all data will be displayed and there after user press key then the filtered result will be displayed..
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Shahan AyyubSenior Software Engineer - iOSCommented:
Hi!

First step is to bind ComboBox with the column you want it to display:
        ComboBox1.DataSource = TestDataSet.tblA            
        ComboBox1.DisplayMember = "Text"                   ' A column "Text" of table "tblA" will be displayed.

You can use query to fill ComboBox as well.(as other experts suggested)

Now set two properties of ComboBox: (from Property window)
"AutoCompleteMode" to  "Suggest"
"AutoCompleteSource' to "ListItems"
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Kalpesh ChhatralaSoftware ConsultantAuthor Commented:
Hi Shahan_Developer,

Combobox Display seperate Suggested Item List

Not  Filter/Search in Dropdown List.
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Kalpesh ChhatralaSoftware ConsultantAuthor Commented:
..
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Shahan AyyubSenior Software Engineer - iOSCommented:
Hi!

Why this multiplier ?? Is your problem not solved ??
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