String or binary data would be truncated.rnThe statement has been terminated.

CREATE TABLE [dbo].[login] (
    [Id]       NVARCHAR (50) NOT NULL,
    [username] NCHAR (10)    NOT NULL,
    [password] NCHAR (10)    NOT NULL,
    [Phone_no] NVARCHAR (50) NOT NULL,
    [Email]    NVARCHAR (50) NOT NULL,
    PRIMARY KEY CLUSTERED ([Id] ASC)
);

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;

public partial class reg : System.Web.UI.Page
{
    SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=C:\Users\SONY\Documents\data.mdf;Integrated Security=True;Connect Timeout=30");
  
    protected void Page_Load(object sender, EventArgs e)
    {
       con.Open();

       
    }
    protected void btn_submit_Click(object sender, EventArgs e)
    {
        Guid newGUID = Guid.NewGuid();
       string insert = "insert into login(Id,username,password,Phone_no,Email) values('" + newGUID.ToString() + "','" + txt_name + "','" + Text_pass + "','" + Text_ph + "','" + Text_mail + "')";
        SqlCommand cmd = new SqlCommand(insert ,con);
        cmd.Connection = con;
        cmd.ExecuteNonQuery();
        con.Close();
        Lbl_reg.Visible = true;

    }
}

When i m trying to save the value then get above mentioned error