How to replace word in text box using Replace method using C# in ASP.Net

hi

I have textbox and Imagebutton in page that when users click on InsertInfo it will insert txtname's text in to database.

I want if users type space in text box it replace space with "-" like:

neda shabazi Replace with neda-shahbazi so I write below code:

  protected void InsertInfo_Click(object sender, ImageClickEventArgs e)
    {
        ReplaceWord();
        InsertInfo();
    }

  private void ReplaceWord()
    {
        this.txtname.Text = this.txtname.Text.Replace("-"," ");
    }

and:

 private void InsertInfo()
    {      
        using (SqlConnection conn = General.GetConnection())
        {
            using (SqlCommand _cmd = General.GetCommand("InsertInfo", conn))
            {
                conn.Open();
 _cmd.Parameters.AddWithValue("@Name", txtname.Text);
_cmd.ExecuteNonQuery();
}
}
}

but here when I type text in textbox and click on button it doesn't do any thing for textbox's text

I mean in database insert neda shahbazi like before...

where is problem?

Best Regards

Neda