form hangs when implementing my logic

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C#

in this code. when user clicks on the submit button without filling both the text fields error message is delivered. but i used a picturebox when the password matches then a pitcturebox is shown to user which contains a tick sign. but the problem is when user clicks the submit button without filling both the fields the picturebox is visible. so i have written method

newval();

which checks for blank textfields of both the text fields and set the piturebox to false. but when i implement the code m form hangs up!1

private void button1_Click(object sender, EventArgs e)
       {
           bool vcom = doublepasword();
           bool vnames = ValidateNames();
           bool vnames2 = ValidateNames2();
           if (!vcom && !vnames&& !vnames2)
           {
               SqlConnection conn = new SqlConnection();
               conn.ConnectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=E:\project\sample project\prject xample2 perfect\login\Database1.mdf;Integrated Security=True;User Instance=True";
               try
               {

                       conn.Open();
                       string qry2 = "UPDATE Table1 SET Password =@Password WHERE username=@username";
                       SqlCommand com = new SqlCommand(qry2, conn);
                       com.Parameters.AddWithValue("@username", this.label1.Text);
                       com.Parameters.AddWithValue("@Password", this.textBox1.Text);
                       int result = com.ExecuteNonQuery();
                       if (result > 0)
                       {
                           MessageBox.Show("updated sucesfull \n" + "your new password is: " + textBox1.Text + " thanks for changing your password", "success");
                           this.Hide();
                           login ls = new login();
                           ls.Show();

                       }
                       else
                       {
                           MessageBox.Show("updated failed");

                       }

                   }
               catch (Exception)
               {
                   MessageBox.Show("Error with the databse connection");
               }
           }
           else
           {
               MessageBox.Show("error");
               validation2();
              neval(); //when i comment this my form runs smoothly but when i uncomment this my form hangs up?? whats the problem in methods??
           }
       }
       public bool ValidateNames()
       {
           if (textBox1.Text == string.Empty)
           {
               return true;
           }
           else
           {
               return false;
           }
       }

       public bool ValidateNames2()
       {
           if (textBox2.Text == string.Empty)
           {
               return true;
           }
           else
           {
               return false;
           }
       }
       public void neval()// is there any problem in this method?
       {
           while (textBox2.Text == "")
           {
               if (textBox1.Text ==  "")
               {
                   pictureBox1.Visible = false;
               }
           }
       }
       private bool doublepasword()
       {
           if (textBox1.Text != textBox2.Text)
           {
               return true;
           }
           else
           {
               return false;
           }
       }
       public bool validation2()
       {
           bool stat1 = doublepasword();
           if (stat1 == true)
           {
               errorProvider1.SetError(textBox2, "password doesnt match");
               pictureBox1.Visible = false;

               return true;
           }
           else
           {
               pictureBox1.Visible = true;

               errorProvider1.SetError(textBox2, string.Empty);
               return false;
           }
       }

       private void textBox2_TextChanged(object sender, EventArgs e)
       {
           validation2();
       }