how to search in database and display result in datagridview

hi i tried this code to search in database and display result in datagridview but it seems something is wrong what is the wrong ? this is my code

    if (comboBox1.Text == "month") {
        SqlDataAdapter dataAdapter = new SqlDataAdapter("SELECT name, mil_no, rotba, arrival_time, leaving_time, day, year FROM dbo.Hodor_data where month LIKE ='" + textBox1.Text + "'", co);
        DataTable dt = new DataTable();
        dataAdapter.Fill(dt);
        dataGridView1.DataSource = dt;
    }

and this is my interface

my interface