Sql server insertion error

try
{
    cmd = new SqlCommand("insert into employeeinfm values (@employeeid,@employeename,@designation,@password,@confirmpwd)", cn);

    cmd.Parameters.Add("@employeeid", SqlDbType.NVarChar, 50)
                   .Value = Txtempid.Text;
    cmd.Parameters.Add("@employeename", SqlDbType.NVarChar, 50)
                   .Value = Txtename.Text;
    cmd.Parameters.Add("@designation", SqlDbType.NVarChar, 50)
                   .Value = Txtdesig.Text;
    cmd.Parameters.Add("@password", SqlDbType.NVarChar, 50)
                   .Value = Txtpwd.Text;
    cmd.Parameters.Add("@confirmpwd", SqlDbType.NVarChar, 50)
                   .Value = Txtconfirmpwd.Text;

    cn.Open();
    cmd.ExecuteNonQuery();
    Label7.Text = "Saved successfully!";
    cn.Close();
}
catch (Exception ex)
{
    Response.Write(ex.Message);
}