Unable to display display data from SQL db in the view MVC.

InvalidOperationException: The model item passed into the ViewDataDictionary is of type 'MVC_ADO.NET_CRUD.Models.Customer', but this ViewDataDictionary instance requires a model item of type 'System.Collections.Generic.IEnumerable`1[MVC_ADO.NET_CRUD.Models.Customer]'.
Microsoft.AspNetCore.Mvc.ViewFeatures.ViewDataDictionary.EnsureCompatible(object value)

ShowAlCustomerDetails.cshtml

@model IEnumerable<MVC_ADO.NET_CRUD.Models.Customer>

<p>
    <a asp-action="Create">Create New</a>
</p>
<table class="table">
    <thead>
        <tr>
            <th>
                @Html.DisplayNameFor(model => model.CustomerID)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Name)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Address)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Mobileno)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Birthdate)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.EmailID)
            </th>
            <th></th>
        </tr>
    </thead>
    <tbody>
        @foreach (var item in Model)
        {
            <tr>
                <td>
                    @Html.DisplayFor(modelItem => item.CustomerID)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Name)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Address)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Mobileno)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Birthdate)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.EmailID)
                </td>
                <td>
                    @Html.ActionLink("Edit", "Edit", new { /* id=item.PrimaryKey */ }) |
                    @Html.ActionLink("Details", "Details", new { /* id=item.PrimaryKey */ }) |
                    @Html.ActionLink("Delete", "Delete", new { /* id=item.PrimaryKey */ })
                </td>
            </tr>
        }
    </tbody>
</table>

Customer.cs

<pre>using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using MVC_ADO.NET_CRUD.Models;
using MVC_ADO.NET_CRUD.DataAccess;
using System.ComponentModel.DataAnnotations;



namespace MVC_ADO.NET_CRUD.Models
{
    public class Customer
    {
        [Key]

        public int CustomerID { get; set; }



        [Required(ErrorMessage = "Enter Name")]

        public string Name { get; set; }



        [Required(ErrorMessage = "Enter Address")]

        public string Address { get; set; }



        [Required(ErrorMessage = "Enter Mobileno")]

        public string Mobileno { get; set; }



        [DataType(DataType.Date)]

        [Required(ErrorMessage = "Enter Birthdate")]

        public DateTime Birthdate { get; set; }



        [Required(ErrorMessage = "Enter EmailID")]

        public string EmailID { get; set; }
       //  public List<Customer> ShowallCustomer { get; set; }
         public List<Customer> ShowallCustomer { get; set; }


    }
}

public List<Customer> Selectalldata()
        {
            SqlConnection con = null;

            DataSet ds = null;
            List<Customer> custlist = null;
            try
            {
                con = new SqlConnection(ConfigurationManager.ConnectionStrings["dbcon"].ToString());
                SqlCommand cmd = new SqlCommand("Usp_InsertUpdateDelete_Customer", con);
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@CustomerID", null);
                cmd.Parameters.AddWithValue("@Name", null);
                cmd.Parameters.AddWithValue("@Address", null);
                cmd.Parameters.AddWithValue("@Mobileno", null);
                cmd.Parameters.AddWithValue("@Birthdate", null);
                cmd.Parameters.AddWithValue("@EmailID", null);
                cmd.Parameters.AddWithValue("@Query", 4);
                con.Open();
                SqlDataAdapter da = new SqlDataAdapter();
                da.SelectCommand = cmd;
                ds = new DataSet();
                da.Fill(ds);
                custlist = new List<Customer>();


                for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                {
                    Customer cobj = new Customer();
                    cobj.CustomerID = Convert.ToInt32(ds.Tables[0].Rows[i]["CustomerID"].ToString());
                    cobj.Name = ds.Tables[0].Rows[i]["Name"].ToString();
                    cobj.Address = ds.Tables[0].Rows[i]["Address"].ToString();
                    cobj.Mobileno = ds.Tables[0].Rows[i]["Mobileno"].ToString();
                    cobj.EmailID = ds.Tables[0].Rows[i]["EmailID"].ToString();
                    cobj.Birthdate = Convert.ToDateTime(ds.Tables[0].Rows[i]["Birthdate"].ToString());

                    custlist.Add(cobj);
                }
                return custlist;
            }
            catch
            {
                return custlist;
            }
            finally
            {
                con.Close();
            }
        }