Here Mudassar Ahmed Khan has explained with an example, how to allow only AlphaNumeric (Letters or Numbers), Underscore in Username and it must have length of 3 to 10 characters using JavaScript.

When the Submit Button is clicked, the Username in the TextBox will be validated using JavaScript and Regular Expression (Regex) and if the Username is invalid, the error message will be displayed next to the TextBox using JavaScript.

Here Mudassar Ahmed Khan has explained with an example, how to Search all (multiple) Columns of DataGridView in Windows Forms (WinForms) Application using C# and VB.Net.

By default the DataGridView will show all records. As soon as user starts to type in the TextBox, the records will be searched in all (multiple) Columns displayed in the DataGridView and the DataGridView rows will be filtered in Windows Forms (WinForms) Application using C# and VB.Net.

Here Mudassar Ahmed Khan has explained with an example, how to retrieve data from Database and display in TextBox in Windows Application (WinForms) using C# and VB.Net.

This article will illustrate how to fetch records (data) from SQL Server Database using SqlDataReader and then set the retrieved values in Windows Application (WinForms) using C# and VB.Net.

Here Mudassar Ahmed Khan has explained with an example, how to retrieve data from Database and set the value in TextBox in ASP.Net using C# and VB.Net.

This article will illustrate how to fetch records (data) from SQL Server Database using SqlDataReader and then set the retrieved values in TextBoxes in ASP.Net using C# and VB.Net.