Combobox with a Table Column Values

Question

0.00/5 (No votes)

See more:

C#

 public partial class New_Quote : Form
    {
        public string busnamevar = "";
public New_Quote()
        {
            InitializeComponent();
            st = "value";
            FillCombo();
        }
  void FillCombo()
        {
           
            string sql = "select cusname from new_customer where busname='"+st+"'";
     //**** string sql = "select cusname from new_customer where busname='"+busnamevar+"'";  
           
            MySqlDataReader reader; 
            try
            {
                con = new MySqlConnection(str);
                con.Open();
              MySqlCommand cmd = new MySqlCommand(sql, con);                
                   
                reader = cmd.ExecuteReader();
                while (reader.Read())
                {
                    string scname = reader.GetString("cusname");
                    comboBox1.Items.Add(scname);
                }
            }
            catch (MySqlException ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }

If i use busname in where clause the value specified in the "st" then it is working fine but if I use the "public string variable busnamevar" then comobobox not contains the values from the table column.

I tried to copy the public string to local variable but it is not working

Posted 16-Jul-13 2:00am

SrinivasTiru

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Naz_Firdouse · Answer 1 · 2013-07-16T02:30:00

does your select statement returns values if the busname is empty???
you set

C#

busnamevar = "";

and you are not assigning any name for the variable.Assign some name and see whether it works or not

Edited: As the OP mentioned that he is passing value from another form

Check this to know how to pass values between the forms

passing values between two windows forms[^]

Hope it helps

Update:

Instead of declaring the variable busnamevar as a string varibale,declare it as a property
and call the method Fillcombo once the value is set

C#

private string _busnamevar = string.Empty;
       public string Busnamevar
       {
           get
           {
               return _busnamevar;
           }
           set
           {
               _busnamevar = value;
               FillCombo();
           }
       }

The query should be

C#

string sql = "select cusname from new_customer where busname='"+Busnamevar+"'";