Question

Hello I have a datatable that I would like to filter with a single textbox, non-case sensitive. In other words when a user starts typing into the textbox, I would like the RowFilter to display any rows that CONTAIN the typed information (again regardless of case).

My current code will only display exact matches and only for a single column (“ID”). There are a few other columns I want to include, i.e. “Title”, “User Name”, “Company”, etc.

Any ideas?

private void searchTextBox_TextChanged(object sender, EventArgs e)
{
   if (searchTextBox.Text.Trim() != "")
   {
      gridToTable.DefaultView.RowFilter = "ID = " + searchTextBox.Text;
   }
   else
   {
      gridToTable.DefaultView.RowFilter = string.Empty;

   }

}

Answer 1

You can use LIKE in the RowFilter and concat all flters with OR.

var rowFilter = string.Format(
        "ID LIKE '%{0}%' OR TITLE LIKE '%{1}%' OR Company LIKE '%{2}%' OR UserName LIKE '%{3}%'"
        , txtSearchID.Text
        , txtSearchTitle.Text
        , txtSearchCompany.Text 
        , txtSearchUserName.Text
    );  
gridToTable.DefaultView.RowFilter = rowFilter;

DataColumn.Expression Property (same syntax for DataView.RowFilter)

But to be honest, i would suggest to use LINQ-to-DataSet instead since it’s much more powerful.

For example:

DataTable tblFiltered = gridToTable.AsEnumerable()
                       .Where(r => r.Field<int>("ID").ToString().Contains(txtSearchID.Text) 
                                || r.Field<string>("TITLE").Contains(txtSearchTitle.Text)
                                || r.Field<string>("Company").Contains(txtSearchCompany.Text)
                                || r.Field<string>("UserName").Contains(txtSearchUserName.Text))
                       .CopyToDataTable();