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Category: C#

Access Modifiers (C# Programming Guide)

Published by admin on July 29, 2014

All types and type members have an accessibility level, which controls whether they can be used from other code in your assembly or other assemblies. You can use the following access modifiers to specify the accessibility of a type or member when you declare it:

public

The type or member can be accessed by any other code in the same assembly or another assembly that references it.

private

The type or member can be accessed only by code in the same class or struct.

protected

The type or member can be accessed only by code in the same class or struct, or in a class that is derived from that class.

internal

The type or member can be accessed by any code in the same assembly, but not from another assembly.

protected internal

The type or member can be accessed by any code in the assembly in which it is declared, or from within a derived class in another assembly. Access from another assembly must take place within a class declaration that derives from the class in which the protected internal element is declared, and it must take place through an instance of the derived class type.

http://msdn.microsoft.com/en-us/library/ms173121.aspx

Change HTMLEncode In An Autogenerated Gridview

Published by admin on February 7, 2014

The only way I found to change the HtmlEncode property on a bound column when auto-generating the grid-view.

protected void grFeedHistoryView_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            BoundField field = (BoundField)((DataControlFieldCell)e.Row.Cells[2]).ContainingField;
            field.HtmlEncode = false;
        }

 

Simple Linq to SQL Insert and Update

Published by admin on January 31, 2014 
private void InsertAndUpdate()
{
  NorthwindDataContext db = new NorthwindDataContext();

  //Insert a record

  Customer newCus = new Customer();
  newCus.CustomerID = "YYYZZ";
  newCus.CompanyName = "Company_Z";

  db.Customers.InsertOnSubmit(newCus);
  db.SubmitChanges();      

  //Update a record
  Customer record = (from p in db.Customers
         where p.CustomerID == "12345" 
         select p).SingleOrDefault();

  Console.WriteLine(default(Customer));
  if (record != default(Customer))
  {
    record.CompanyName = "Company_A";
  }

  db.SubmitChanges();
}

 

C# List to DataTable

Published by admin on October 15, 2013

Don’t recall where I found this but converts List to DataTable.

public static System.Data.DataTable ToDataTable<T>(this IList<T> data)
        {
            System.ComponentModel.PropertyDescriptorCollection props = System.ComponentModel.TypeDescriptor.GetProperties(typeof(T));
            System.Data.DataTable table = new System.Data.DataTable();
            for (int i = 0; i < props.Count; i++)
            {
                System.ComponentModel.PropertyDescriptor prop = props[i];
                table.Columns.Add(prop.Name);
                //table.Columns.Add(prop.Name, prop.PropertyType);
            }
            object[] values = new object[props.Count];
            foreach (T item in data)
            {
                for (int i = 0; i < values.Length; i++)
                {
                    values[i] = props[i].GetValue(item);
                }
                table.Rows.Add(values);
            }
            return table;
        }

 

Using C# to check if string contains a string in string array

Published by admin on October 15, 2013

Pieced this together from stackoverflow… http://stackoverflow.com/questions/2912476/using-c-sharp-to-check-if-string-contains-a-string-in-string-array/2912541#2912541

string stringToCheck = "text1";
string[] stringArray = { "text1", "testtest", "test1test2", "test2text1" };

This checks if stringToCheck contains any one of substrings from stringArray.

if(stringArray.Any(stringToCheck.Contains))

If you want to ensure that it contains all the substrings, change Any to All:

if(stringArray.All(s => stringToCheck.Contains(s)))

 

Regex for Credit Card Numbers

Published by admin on September 5, 2013

Here is a regular expression for credit card numbers.

string ccRegEx = @"^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11})$";

Regex for U.S. and Canadian Zip Codes

Published by admin on September 5, 2013

Below is the regex code for U.S. and Canadian zip codes. I’m don’t remember where I found these but hopefully someone finds them useful.

string _usZipRegEx = @"^\d{5}(?:[-\s]\d{4})?$";
string _caZipRegEx = @"^([ABCEGHJKLMNPRSTVXY]\d[ABCEGHJKLMNPRSTVWXYZ])\ {0,1}(\d[ABCEGHJKLMNPRSTVWXYZ]\d)$";