How to pass parameters from one function to another?both the methods are in the same class...

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Data;
using System.Data.SqlClient;
 
namespace WpfApplication7
{
///

/// Interaction logic for Window3.xaml
///

public partial class Window3 : Window
{

public Window3()
{
InitializeComponent();
FillDataGrid();

}
 
private void Window_Loaded(object sender, RoutedEventArgs e)
{
 
}
 
private void Window_Loaded_1(object sender, RoutedEventArgs e)
{
 
}
private void comboBox1_Loaded(object sender, RoutedEventArgs e)
{
List data = new List();
data.Add("APPLE");
data.Add("GOOGLE");
data.Add("INFOSYS");
data.Add("IBM");
data.Add("HP");
 
// ... Get the ComboBox reference.
var comboBox1 = sender as ComboBox;
 
// ... Assign the ItemsSource to the List.
comboBox1.ItemsSource = data;
}

public void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
var comboBox1 = sender as ComboBox;
string value = comboBox1.SelectedValue as string;

}
 
public void FillDataGrid()
{

SqlConnection con = new SqlConnection("Data Source=ANAIK-PC;Initial Catalog=wpfstocks;Integrated Security=True");
string command = "select * from applel2";
SqlCommand cmd = new SqlCommand(command, con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable("applel2");
da.Fill(dt);
dataGrid1.ItemsSource = dt.DefaultView;
} 
} 
}