Fill ASP.Net TextBox if record exist in database using C#

i want to display employee record if employee record is exist when i enter employee id in textbox. when i enter employee id in textbox and it exist in database then employee record should be display in textboxes and required controls like emp name, emp address emp gender, emp mobileno.

i have try to do this but there is no result. its not return any result or action.

SqlConnection con = new SqlConnection(sqlcon);
con.Open();
string sqlSelect = "SELECT empname,empaddress, empcity,empgender,empage FROM empmaster WHERE empid LIKE'"+ txtSearch.Text +"'%'";
SqlCommand cmd = new SqlCommand(sqlSelect, con);
SqlDataReader sdr = cmd.ExecuteReader();
while (dataRead.Read())
{
    string vname = dataRead["empname"].ToString();
    string[] str = vname.Split(' ');
    for (int n = 0; n < str.Length; n++)
    {
        txtfname.Text = str[0];
        txtmname.Text = str[1];
        txtlname.Text = str[2];
    }
    txtaddress.Text = dataRead.GetValue(1).ToString();
    txtcity.Text = dataRead.GetValue(2).ToString();
    dropgender.Text = dataRead.GetValue(6).ToString();
    dropidtype.Text = dataRead.GetValue(7).ToString();
    txtage.Text = dataRead.GetValue(9).ToString();
}
con.Close();

error is 

ErrorSystem.IndexOutOfRangeException: Index was outside the bounds of the array.