[Added] added ProfilePicture model and view

Models/ProfilePicture.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Web;
+using System.Web.UI;
+
+namespace ERPSystemTimologio.Models
+{
+    public class ProfilePicture
+    {
+        public string ErrorMessage { get; set; }
+        public decimal Filesize { get; set; }
+        public string Upload(HttpPostedFileBase file, string username)
+        {
+            try
+            {
+                var supportFileType = new[] { "jpg", "jpeg", "png", "gif" };
+                var getFileExtension = Path.GetExtension(file.FileName).Substring(1);
+
+                if (!supportFileType.Contains(getFileExtension))
+                {
+                    ErrorMessage = "File must be jpg/jpeg/png/gif format";
+                    return ErrorMessage;
+                }
+                else if (file.ContentLength > (Filesize * 1024))
+                {
+                    ErrorMessage = "File size must be less than " + Filesize + "KB";
+                    return ErrorMessage;
+                }
+
+                string _path = Path.Combine(HttpContext.Current.Server.MapPath("~/Content/images/avatar"), username + "." + getFileExtension);
+                file.SaveAs(_path);
+
+                return null;
+            }
+            catch (Exception)
+            {
+                ErrorMessage = "Upload Container Should Not Be Empty";
+                return ErrorMessage;
+            }
+        }
+    }
+}

Views/Dashboard/ProfilePicture.cshtml

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+
+@{
+    ViewBag.Title = "ProfilePicture";
+
+    ERPSystemTimologio.EF.User sessionUser = null;
+
+    if (Session["user"] != null)
+    {
+        sessionUser = (ERPSystemTimologio.EF.User)Session["user"];
+    }
+}
+
+<form action="@Url.Action("ProfilePicture", "Dashboard")" method="POST" enctype="multipart/form-data">
+    <div class="card text-center">
+        <div class="card-body">
+            <div class="row mb-3 has-validation">
+                <label for="avatar" class="col-sm-3 col-form-label">Avatar</label>
+                <div class="col-sm-9">
+                    <div class="custom-file">
+                        <input type="file"
+                               class="custom-file-input form-control @(!ViewData.ModelState.IsValidField("Avatar") ? "is-invalid" : "")" id="avatar"
+                               name="Avatar">
+                        <label class="custom-file-label" for="avatar">Choose file</label>
+                    </div>
+                </div>
+            </div>
+            <div class="row mb-3">
+                <div class="col-sm-9 offset-sm-3">
+                    <button id="avatar-upload-btn" type="submit" class="btn btn-success">Upload</button>
+                </div>
+            </div>
+        </div>
+        @if (sessionUser != null && sessionUser.Avatar != null)
+        {
+            <div class="card-footer">
+                <img src="@Url.Content("~/Content/images/"+sessionUser.Avatar.ToString())" class="img-thumbnail rounded mx-auto d-block" alt="@sessionUser.Name">
+            </div>
+        }
+    </div>
+</form>