Thursday, February 19, 2015

Filtering DataGridView by Textbox change in C#

In this article, I will show you how to filter a DataGridView when typing in Textbox. One column value should be used to check the word pattern when filtering. Here, I used first_name column values to apply the filtering process. When you type word pattern in Textbox, it will only show the rows which has same pattern with the entered word.

Open a New Project and create a Windows Form Application and add a Textbox and DataGridView.   
Call the following method from the Form_Load method to fill the DataGridView from Database.
Declare a DataSet object called ds as global variable.

private void fillDataGridView() {
                       // string connectionString = "Data Source=.;Initial Catalog=pubs;Integrated Security=True";
            string connectionString = "Server=localhost\\sqlexpress;Database=test;User Id=sa;Password=abc123;";
            string sql = "SELECT * FROM student";
            SqlConnection connection = new SqlConnection(connectionString);
            SqlDataAdapter dataadapter = new SqlDataAdapter(sql, connection);
            ds = new DataSet();
            dataadapter.Fill(ds, "test");
            dataGridView1.DataSource = ds;
            dataGridView1.DataMember = "test";        

Double click on the Textbox to create it's TextChange event (In my case txtSearch_TextChanged).
Then add the below code segment to that method.

            DataView dataView = new DataView(ds.Tables[0]);
            dataGridView1.DataSource = dataView;

            dataView.RowFilter = string.Format("first_name LIKE '{0}%'", txtSearch.Text);
            dataGridView1.DataSource = dataView;

You can also change {0}%  into %{0}% and %{0}

Now you can check the run the project.
Do not forget to leave your comments below.

1 comment:

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