For inti As Integer = 0 To ComboBox1.Items.Count - 1
      For intj As Integer = 0 To ComboBox2.Items.Count - 1
          If ComboBox1.Items(inti).ToString =  
ComboBox2.Items(intj).ToString Then
             MessageBox.Show(ComboBox1.Items(inti))
          End If
      Next
  Next

For inti As Integer = 0 To ComboBox1.Items.Count 
      For intj As Integer = 0 To ComboBox2.Items.Count 
          If ComboBox1.Items(inti).ToString =  
ComboBox2.Items(intj).ToString Then
             MessageBox.Show(ComboBox1.Items(inti))
          End If
      Next
  Next


The answer should be modified. The loop should not go upto 
the count-1 but should go upto count. Rest all is OK.

/* C# Version */

for (int i=0; i<= ComboBox1.Items.Count)
  {
    for(int j=0 ; j<= ComboBox2.Items.count)
       {
         if (ComboBox1.Items[i].Text == ComboBox2.Items
[j].Text)
            MessageBox.Show(Items[i].Text);
       }
   }

Compare the values in both the comboboxes :


if(comboBox1.Text == comboBox2.Text)
{
    MessageBox.Show(comboBox1.Text);

}

bool found = false;
string item = string.Empty;
foreach (string item1 in comboBox1.Items)
{
	foreach (string item2 in comboBox2.Items)
	if (item1 == item2)
	{
		item = item1;
		found = true;
		break;
	}
	if (found) break;
}
MessageBox.Show(found ? item : "Not found");