Why multiselected text files don't open in more tabs

[C# Programming]

Everytime i multiselect files it creates so many tabs as files selected..but there is only text of first file in first tab..other tabs are empty...
Here i have code for opening file:

private void evtOpenFile_Click(object sender, EventArgs e)
{
openFileDialog1.Multiselect = true;


if (openFileDialog1.ShowDialog() == DialogResult.OK)
{

foreach (String file in openFileDialog1.FileNames)
{

evtNewDocument_Click(sender, e);


RichTextBox richTextBox1 = new RichTextBox();

richTextBox1 = tabControl1.SelectedTab.Controls[0] as RichTextBox;

richTextBox1.LoadFile(openFileDialog1.FileName,RichTextBoxStreamType.PlainText);
saveFileDialog1.FileName = openFileDialog1.FileName;

FileInfo fi = new FileInfo(openFileDialog1.FileName);
string pot = fi.Name;

tabControl1.SelectedTab.Text = pot;

pot = "";
}


}
}


evtNewDocument_Click(sender, e); creates new tab in tabcontrol with selectedindex on it! Still can't figure out what is wrong... PLZ HELP!

THanks