GridView Filter using LINQ

We shall see, how to implement a Client side GridView Filter using LINQ, without hitting the database. We will be using a C# List as the data source to the Grid View, instead we can also use a DataTable.

To know more about binding a C# List to a GridView refer the post Binding a C# List to a GridView control

First let us create a class whose objects will be stored in the List (refer post Binding a C# List to a GridView control)

Next, let us create a list of objects based on our class clsCountry and store them in a List object. Here is the code for the List

List<clsCountry> lstCountry = new List<clsCountry>();

lstCountry.Add(new clsCountry("USA", "United States"));

lstCountry.Add(new clsCountry("UK", "United Kingdon"));

lstCountry.Add(new clsCountry("IND", "India"));

lstCountry.Add(new clsCountry("RUS", "Russia"));

lstCountry.Add(new clsCountry("SA", "South Africa"));

lstCountry.Add(new clsCountry("AUS", "Australia"));

Finally we shall bind the List object lstCountry to a GridView control. Here the code to bind the data.

grdCountry.DataSource = lstCountry;

grdCountry.DataBind();

Now this will bind all the value to the GridView, to filter the values we need to add a LINQ filter and bind the filtered values to the GridView, as follows

var filteredCountries = from c in lstCountry

where c.CountryName.Contains(txtFilter.Text)

select c;

grdCountry.DataSource = filteredCountries;

grdCountry.DataBind();

Here the LINQ expression takes the filter text from the textbox txtFilter.Text, and applies the filter on the List object, the result of the filter expression in bound to the GridView.

In this example we have used a List object, instead we can also use a DataTable and apply the LINQ filter to the DataTable.

That’s it we have filtered the contents of GridView control using LINQ filters.

Related Post

Binding a C# List to a GridView control
What is LINQ?