C#

If two objects compare as equal, the GetHashCode method for each object must return the same value. However, if two objects do not compare as equal, the GetHashCode methods for the two object do not have to return different values.

The GetHashCode method for an object must consistently return the same hash code as long as there is no modification to the object state that determines the return value of the object's Equals method. Note that this is true only for the current execution of an application, and that a different hash code can be returned if the application is run again.

BobJanova wrote:

I think that you are only going to be sacrificing a bit of performance, not creating subtle bugs, because the .Net hashtable will look through all the items if it doesn't get a hash hit.

csshtml wrote:

I have a question if someone can kindly refer me to a good source, on how to make a visual c # dictionary.

Bastard Programmer from Hell

System.Data.DataTable dt = new System.Data.DataTable() ;
dt.Columns.Add ( new System.Data.DataColumn ( "Word" ) ) ;
dt.Columns.Add ( new System.Data.DataColumn ( "Definition" ) ) ;

System.Data.DataRow dr ;
        
dr = dt.NewRow() ;
dr [ 0 ] = "CAT" ;
dr [ 1 ] = "Man's worst enemy" ;
dt.Rows.Add ( dr ) ;
  
dr = dt.NewRow() ;
dr [ 0 ] = "CART" ;
dr [ 1 ] = "Don't put it before the horse" ;
dt.Rows.Add ( dr ) ;
  
dr = dt.NewRow() ;
dr [ 0 ] = "COT" ;
dr [ 1 ] = "A place to rest at work" ;
dt.Rows.Add ( dr ) ;
  
this.comboBox1.DataSource = dt.DefaultView ;
this.comboBox1.DisplayMember = "Word" ;
this.comboBox1.AutoCompleteMode = System.Windows.Forms.AutoCompleteMode.SuggestAppend ;
this.comboBox1.AutoCompleteSource = System.Windows.Forms.AutoCompleteSource.ListItems ;
this.comboBox1.SelectedIndexChanged += delegate ( object sender , System.EventArgs e )
{
  this.textBox1.Text = (string) ((System.Data.DataRowView) this.comboBox1.SelectedItem) [ 1 ] ;
} ;

System.Data.DataView dv = this.cbItemName.DataSource as System.Data.DataView ;
if ( dv != null )
{
  try
  {
    dv.RowFilter = System.String.Format ( "Name LIKE '%{0}%'" , this.tbSearchText.Text ) ;

    this.tbSearchText.BackColor = System.Drawing.SystemColors.Window ;
  }
  catch
  {
    this.tbSearchText.BackColor = System.Drawing.Color.LightPink ;
  }