using a masked text box

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C#

hi! i'm developing an application where a user has to log in to work with that app and its working fine but the only problem with is that to enter the password i have used a text box instead of a masked text box that is coz i'm unable to get the values from the masked text box i mean i have to retrieve the value that a person has typed in the masked text box and compare it with the database but i don't know how to get that value and there is one more constraint that is before all this i need to check if the masked text box is empty if so i have to display a message telling the user that he/she have entered an empty password
so any thoughts on this.
thank you in advance.
how ever the code i used is here

private void btnLogin_Click(object sender, EventArgs e)
     {
         int f = 1;
         if (txtboxLoginName.Text == "")
         {
             MessageBox.Show("enter user name");
         }
         else
         {
          string Qstr = null;
          Qstr = "select * from password";
         dsBind = dm.GetDataSet(Qstr);
         int j;
         for (j = 0; j < dsBind.Tables[0].Rows.Count; j++)
          {
         if (txtBoxLoginName.Text.Equals(dsBind.Tables[0].Rows[j]["name"]))
           {
      if (txtBoxPassword.Text.Equals(dsBind.Tables[0].Rows[j]["password"]))
                     {
                         f = 0;
                         break;
                     }
                 }
             }
             if(f == 0)
             {
               MessageBox.Show("you are logged in");
             }
             else
             {
               MessageBox.Show("password and user name  did not match");
             }
          }
      }