combobox selected index changed event

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C#

C#4.0

Hi,

I have two comboboxes.
combobox1 values
1000
1001
1002
1003
1004
combobox2 values
1000
1001
1002
1003
1004

Now I want to select data from database based on the two combobox value.

For example combobox1 = 1001 and combobox2=1004, then I need to select data between these two values.
Actually I wrote code to get value from database.

The code for combobox2_selectedindexchange event is...

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
     if (string.IsNullOrEmpty(comboBox4.Text))
     {
           MessageBox.Show("From should not be empty");
     }
     else
     {
           comp.FROM = Convert.ToInt32(comboBox4.Text);
     }

     if (string.IsNullOrEmpty(comboBox5.Text))
     {
           MessageBox.Show("To Should not be empty");
     }
     else
     {
           comp.TO = Convert.ToInt32(comboBox5.Text);            
     }
     
     DataTable result = inter.getapplicationinformationstage1(comp);
     dataGridView1.DataSource = result;
}

But when I select data from combobox1, it automatically calls the event even I am not selecting the combobox2 value and when I select any value from any one of combobox, then that value automatically set into another combobox.
How can solve this ?