geeting an error

Question

this is my code trying to compare the strings in the text box2 and display the matched string in the label   i am getting an error  please help me 
protected void Button1_Click(object sender, EventArgs e)

    {

        SqlCommand cmd = new SqlCommand("insert  comparative values('" + TextBox1.Text + "','" + TextBox2.Text + "')", con);

        cmd.ExecuteNonQuery();

        

        SqlDataReader reader = null;

      

       // cmd.Parameters.AddWithValue("@name", TextBox2.Text);

        //cmd.Parameters.AddWithValue("SELECT  FROM places where name=@name",TextBox2.Text);

        cmd.Parameters.AddWithValue("select textbox2.text from places where [email protected]",con);

        reader = cmd.ExecuteReader();

        while (reader.Read())

        { 

            

            TextBox2.Visible = true;

            TextBox2.Text = Convert.ToString(reader["TextBox2"]);

        }

      

            Label4.Text= TextBox2.Text;

        

        

        con.Close();

    }