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afzal February 2016

Max file size validation attribute is not working in mvc 4

My problem is that if I upload the file more than 4 mb throwing exception "Maximum request length exceeded."

My requirements is that: Should show the validation error message.I am not sure whether i'm wrong. Please help me some one


public class FileSizeAttribute : ValidationAttribute
    private long _maxSize;

    /// <summary>
    /// Default constructor. defines maximum size of the file.
    /// </summary>
    public FileSizeAttribute()
         _maxSize = Convert.ToInt32(ConfigurationManager.AppSettings["FileSize"]);

    /// <summary>
    /// Override IsValid method to validate the decorated property
    /// </summary>
    /// <param name="value"></param>
    /// <returns></returns>
    public override bool IsValid(object value)
        var file = value as HttpPostedFileBase;

        if (file == null) return true;

        return file.ContentLength <= _maxSize;

    /// <summary>
    /// Override format message method to return failure message.
    /// </summary>
    /// <param name="name"></param>
    /// <returns></returns>
    public override string FormatErrorMessage(string name)
        return string.Format("The file size should not exceed {0} MB", Math.Ceiling((_maxSize / 1024f) / 1024f));

Property Model:

    public HttpPostedFileBase File

In Web Config file

<httpRuntime maxRequestLength="10240" targetFramework="4.5" />


Shah NIral February 2016

Use MaxFileSize In Model Property Directly

[MaxFileSize(10 * 1024 , ErrorMessage = "Maximum allowed file size is {0} bytes")]


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Asked in February 2016
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