Extract similar data from text file as input in the textbox

Question

I want to extract the input data in text box from text file and want to display the result in datagrid.

i am using textbox for userentry, a button for loading the requirement and datagrid to fill the requirement and display ...

private void Button_Click(object sender, RoutedEventArgs e)
{
{
string var;
var = tb.Text;
var queryname = new List();
using (StreamReader reader = new StreamReader("C:\\Documents\\TestFile.txt"))
{
while (true)
{
string line = reader.ReadLine();
if (line == null)
{
break;
}
queryname.Add(new QueryName(line));
}
}
//var grid = sender as DataGrid;
dg.ItemsSource = queryname;
}