Ali Raza Zaidi

Dynamics 365 development notes

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asp.net

how to clear controls in asp.net c#

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Use following code in you page. At Calling Statement send reference of page “this”. It Clears all text boxes and set all checkboxes on page to false

private void ClearControls(Control parent)
{
foreach (Control _ChildControl in parent.Controls)
{
if ((_ChildControl.Controls.Count > 0))
{
ClearControls(_ChildControl);
}
else
{
if (_ChildControl is TextBox)
{
((TextBox)_ChildControl).Text = string.Empty;
}
else
if (_ChildControl is CheckBox)
{
((CheckBox)_ChildControl).Checked = false;
}

}
}
}

How to get uploaded image dimensions in asp.net

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I used following code to get uploaded image dimensions .
Where flLogoUplaoded is name of asp .net file uploaded control at my application
string UploadedImageType = flLogoUpload.PostedFile.ContentType.ToString().ToLower();
string UploadedImageFileName = flLogoUpload.PostedFile.FileName;

//Create an image object from the uploaded file
System.Drawing.Image UploadedImage = System.Drawing.Image.FromStream(flLogoUpload.PostedFile.InputStream);

//Determine width and height of uploaded image
float UploadedImageWidth = UploadedImage.PhysicalDimension.Width;
float UploadedImageHeight = UploadedImage.PhysicalDimension.Height;

Response.Write( UploadedImageWidth + “<br />”);
Response.Write(UploadedImageHeight + “<br />”);

URL Encoding in asp.net

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One of way while transferring data from one page to other page is Querystring. But one problem is with Querystring is that many characters are not allowed in url.  So we must have to send querystings while take limits in mind because alphanumeric and special characters including $-_.+!*’(),) are allowed. Usually browser does not tolerate special characters in Url, so much data is lost . In asp.net we can use the feature urlEncoding. With Url encoding special characters are replaced by escaped characters sequences starting with the percent sign (%) ,followed by a two-digit hexadecimal .The only exception is space character where character sequence %20 or + sign is used.  For this purpose asp.net provide us HttpServerUtility  class to encode data.

For example

String  CustomerName = “Ali Raza”;

Response.Redirect(“Blogpage.aspx?authorName=” + Server.UrlEncode(CustomerName));

 

Same time we can Querystring s initial values from Server.UrlDecode() method.