Tag: c#
HTTP Status Code in case of Exception
This is how to get HTTP Status code in case of an Exception during HttpWebRequest catch(WebException ex) { HttpWebResponse res = (HttpWebResponse) ex.Response; Console.WriteLine("Http status code: " + res.StatusCode); }
ASP.NET GridView Paging and Sorting
Below is the sample to include Sorting and Paging in ASP.Net GridView. ASPX Code <asp:GridView ID="grd" runat="server" AutoGenerateColumns="False" AllowSorting="true" OnSorting="grd_Sorting" AllowPaging="true" PageSize="50" OnPageIndexChanging="grd_PageIndexChanging"> Code Behind protected void grd_Sorting(object sender, GridViewSortEventArgs e) { try { mDT = GetData(); SetSortDirection(SortDirection); if (mDT != null) { mDT.DefaultView.Sort = e.SortExpression + " " + _sortDirection; grd.DataSource = mDT; grd.DataBind(); […]
ASP.NET AJAX File Upload
jQuery can help in uploading a file on asp.net web page asynchronously. Add a generic handler in asp.net project like below. Upload Generic Handler – Code behind file (upload.ashx) public class upload : IHttpHandler { public void ProcessRequest(HttpContext context) { string fileName = HttpContext.Current.Request.QueryString["FileName"].ToString(); using (FileStream fs = File.Create("[Path]\\" + fileName)) { Byte[] buffer = […]
C# snippets
Converting a string to byte-array without using an encoding (byte-by-byte) static byte[] GetBytes(string str) { byte[] bytes = new byte[str.Length * sizeof(char)]; System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length); return bytes; } static string GetString(byte[] bytes) { char[] chars = new char[bytes.Length / sizeof(char)]; System.Buffer.BlockCopy(bytes, 0, chars, 0, bytes.Length); return new string(chars); } Using String Format to […]
C# DataTable select method
DataTable has a Select method. This method receives a string expression that specifies what rows you want to handle. Selection based on a string expression DataRow[] result = table.Select("Size >= 230 AND Sex = 'm'"); Selection based on DateTime DataRow[] result = table.Select("Date > #6/1/2001#"); Number of records for a particular criteria int numberOfRecords = […]
DataTable to HTML Table C# code
C# DataTable to a HTML Table Below is C# function to generate HTML table string from DataTable with custom options like Custom headers and Selected fields. “Format” in parameters will contain comma separated values like column1=column 1 name, column2=column 2 name and so on. public static string DataTableToHtmlTable(DataTable TableData, string Format) { try { Dictionary<string, […]
Datatable to CSV file
C# DataTable to a CSV file C# DataTable to a CSV file with default options i.e. all columns with default column names public static string DataTableToCsvFile(DataTable TableData, string FileName) { try { // change this with any delimiter you want string Delimiter = ","; int i = 0; StreamWriter sw = null; sw = new […]
ASP.Net persist readonly textbox value on postback
As a security measure in the asp.net the readonly fields and disabled fields loose their values in postbacks. To retain the readonly textbox value after postback instead of making the textbox readonly using properties option, use attributes in code: TextBox1.Attributes.Add(“readonly”, “readonly”); that will still make the textbox readonly and will also retain the value after […]
ASP.NET calling Webmethod using jQuery
To call Webmethod asynchronously in ASP.net through jQuery Javascript Code <script type=”text/javascript”> function Authenticate() { $.ajax({ type: "POST", url: "/login.aspx/Authenticate", data: "{ provide json data }", contentType: "application/json; charset=utf-8", dataType: "json", success: function(msg) { if (msg.d == '1') { alert(‘authenticated’); } else { alert("not authenticated"); } }, error: function() { alert("Error :("); } }); }; […]
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