Link list box with DataBase in window form

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Here i will explain How to connect ListBox with database.It is same as Link a combo Box with database.

Step(1):- Form
Drag and down a List box from Toolbox.

Step(2):- Code
Now make a function for filling the list box from database and call this method in constructor.

Void fillListBox()

{

    string str = "server = MUNESH\\SQL2008R2;Database=datastore;UID=sa;Password=123;";

    SqlConnection con = new SqlConnection(str);

    string query = "select * from tablename";

    SqlCommand cmd = new SqlCommand( query,con); 

    sqldatareader dbr;

    try

    {

        con.open();

        dbr = cmd.executereader();

        while(dbr.read())

        {

           string sname = (string) myreader["name"];; //name is coming from database

           Listbox1.items.Add(sname);

         }

         catch(execption es)

         {

              messagebox.show(es.message);

         } 

    }

}

Now call this method.
Public Form2()
{
InitializeComponent();
FillListBox();
}
Step(3):- Run 
Now Run your application

                                                                                                                                               Previous..
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Database values in textbox if select Combobox in window form

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Here i will explain that when i select any name from combobox then is all detail show in respective textboxes.

Step(1):-Form with combobox
drag and down a combobx from toolbox.

Step(2):-Coding
Click on combobox and write this coding.

Private Void comboBox1.SelectedIndexChanged(object sender , EventArgs e)

{

    string str = "server = MUNESH\\SQL2008R2;Database=datastore;UID=sa;Password=123;";

    SqlConnection con = new SqlConnection(str);

    string query = "select * from tablename where name = '"+combobox1.text+"' ";

    SqlCommand cmd = new SqlCommand( query,con);

    sqldatareader dbr;

    try

    {

        con.open();

        dbr = cmd.executereader();

        while(dbr.read())

        {

            string sID = (string) dbr["ID"].tostring;

            string sname = (string) dbr["name"] // name is string value

             string ssurname = (string) dbr["surname"] 

            string sage = (string) dbr["age"].tostring;

            textbox1.text = sid;

            textbox2.text = sname;

            textbox3.text = ssurname ;

            textbox4.text = sage;

        }

        catch(execption es)

        {

           messagebox.show(es.message);

        }

    }

}

Step(3):-Output
Run your application and click on name which is in combobox.

                                                                                                                                            previous....
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Link ComboBox with database in window form

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Here i will explain how to Link combobox with database. Before this o explained that How to use combobox.

Step(1) :- Form with ComboBox
Drag and down a combobox from tool Box.

Step(2) :- Coding
Now at coding section make a function which is connected with database. And call this method in constructor.

Void fillcombo()

{

    string str = "server = MUNESH\\SQL2008R2;Database=datastore;UID=sa;Password=123;";

    SqlConnection con = new SqlConnection(str);

    string query = "select * from tablename";

    SqlCommand cmd = new SqlCommand( query,con); 

    sqldatareader dbr;

    try

    {

        con.open();

        dbr = cmd.executereader();

        while(dbr.read())

        {

           string sname = (string) myreader["name"];; //name is coming from database

           combobox1.items.Add(sname);

         }

         catch(execption es)

         {

              messagebox.show(es.message);

         } 

    }

}

Step(3) :- Output

When you run your application the data(we are fatching name from database) will be store in combobox.

                                                                                                                                           Previous...
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How to Use comboBox in window form

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Here i will explain how to use combo box in window application. Before this i explain that  delete selected data from database.

Step(1) :- registration form with a combo box 
 Drag and down a Combo box and a button from tool Box. And give the name of button As "Add string"

Step(2) :- Code1
 At first step i want that when i enter name and click on Button(Add string) then that name show in combo box.
So click on Add String button and write this code.

    private void Addstring_Click(object sender, EventArgs e)
{
string namestr = Name_txt.Text;
comboBox1.Items.Add(namestr);
}

Step(3) :- OutPut for code1
 when you enter name textbox and click on button(add string) you will see taht name will show in comboBox.

Step(4) :- Code2

Now if we want that when i click on any name which is in combobox that name show in a textbox. so code for that.Click on combo box and write this code. I want that selected name from combo box show in Id textbox.

 private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    Eid_txt.Text = comboBox1.text;
}
Step(5) :- OutPut for code2
Now select any name in combobx that name will show in Id text box.

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