C#

#region Constructor

public YourClassNameHere()
{
	editexGroups = new Hashtable( 24 );
	editexGroups[ 'a' ] = new int[] { 0 };
	editexGroups[ 'b' ] = new int[] { 1 };
	editexGroups[ 'c' ] = new int[] { 2, 9 };
	editexGroups[ 'd' ] = new int[] { 3 };
	editexGroups[ 'e' ] = new int[] { 0 };
	editexGroups[ 'f' ] = new int[] { 7 };
	editexGroups[ 'g' ] = new int[] { 6 };
	editexGroups[ 'i' ] = new int[] { 0 };
	editexGroups[ 'j' ] = new int[] { 6 };
	editexGroups[ 'k' ] = new int[] { 2 };
	editexGroups[ 'l' ] = new int[] { 4 };
	editexGroups[ 'm' ] = new int[] { 5 };
	editexGroups[ 'n' ] = new int[] { 5 };
	editexGroups[ 'o' ] = new int[] { 0 };
	editexGroups[ 'p' ] = new int[] { 7 };
	editexGroups[ 'q' ] = new int[] { 2 };
	editexGroups[ 'r' ] = new int[] { 4 };
	editexGroups[ 's' ] = new int[] { 8, 9 };
	editexGroups[ 't' ] = new int[] { 3 };
	editexGroups[ 'u' ] = new int[] { 0 };
	editexGroups[ 'v' ] = new int[] { 7 };
	editexGroups[ 'x' ] = new int[] { 8 };
	editexGroups[ 'y' ] = new int[] { 0 };
	editexGroups[ 'z' ] = new int[] { 8, 9 };
}

#endregion

#region Editex Distance

/// <summary>
/// Calculates the Editex distance between two strings.
/// </summary>
/// <param name="first">The first <see cref="string"/>.</param>
/// <param name="second">The second <see cref="string"/>.</param>
/// <returns>The Editex distance between the two <see cref="string"/>s.</returns>
public int EditexDistance( string first, string second )
{
	first = StringCleaner.NullToEmpty( first ).ToLower();
	second = StringCleaner.NullToEmpty( second ).ToLower();

	if( ( first == string.Empty && second == string.Empty ) || first == second )
	{
		return 0;
	}

	int[,] array = new int[ first.Length + 1, 2 ];
	array[ 0, 0 ] = 0;
	array[ 1, 0 ] = 1;
	array[ 0, 1 ] = 1;
	for( int i = 2; i < first.Length + 1; i++ )
	{
		array[ i, 0 ] = array[ i - 1, 0 ] + d( first[ i - 2 ], first[ i - 1 ] );
		array[ i, 1 ] = array[ i - 1, 0 ] + d( first[ i - 2 ], first[ i - 1 ] );
	}

	int sourceColumn = 0;
	int targetColumn = 1;
	int left = 0;
	int up = 0;
	int diag = 0;
	for( int i = 1; i < second.Length + 1; i++ )
	{
		array[ 0, targetColumn ] = ( ( i != 1 )? array[ 0, sourceColumn ] + d( second[ i - 2 ], second[ i - 1 ] ) : 1 );

		for( int j = 1; j < first.Length + 1; j++ )
		{
			left = array[ j, sourceColumn ];
			up = array[ j - 1, targetColumn ];
			diag = array[ j - 1, sourceColumn ] + r( first[ j - 1 ], second[ i - 1 ] );
			if( j > 1 )
			{
				up += d( first[ j - 2 ], first[ j - 1 ] );
			}
			else
			{
				up++;
			}
			if( i > 1 )
			{
				left += d( second[ i - 2 ], second[ i - 1 ] );
			}
			else
			{
				left++;
			}
			array[ j, targetColumn ] = StringComparer.Min( left, up, diag );
		}

		sourceColumn = Math.Abs( sourceColumn - 1 );
		targetColumn = Math.Abs( targetColumn - 1 );
	}
		
	return array[ first.Length, sourceColumn ];
}

/// <summary>
/// Calculates the <i>d</i>-value according to the Editex
/// algorithm.
/// </summary>
/// <param name="a">The first character.</param>
/// <param name="b">The second character.</param>
/// <returns>
/// Refer to the algorithm.
/// </returns>
private int d( char a, char b )
{
	if( a == 'h' || a == 'w' )
	{
		return 1;
	}
	else if( b == 'h' || b == 'w' )
	{
		return 0;
	}
	return r( a, b );
}

/// <summary>
/// Calculates the <i>r</i>-value according to the Editex
/// algorithm.
/// </summary>
/// <param name="a">The first character.</param>
/// <param name="b">The second character.</param>
/// <returns>
/// Refer to the algorithm.
/// </returns>
private int r( char a, char b )
{
	if( a == b )
	{
		return 0;
	}
	bool inSameGroup = false;
	int[] ga = ( int[] ) editexGroups[ a ];
	int[] gb = ( int[] ) editexGroups[ b ];
	if( ga == null || gb == null )
	{
		return 0;
	}
	for( int i = 0; i < ga.Length && !inSameGroup; i++ )
	{
		for( int j = 0; j < gb.Length && !inSameGroup; j++ )
		{
			inSameGroup = ( ga[ i ] == gb[ j ] );
		}
	}
	return ( ( inSameGroup )? 1 : 2 );
}

/// <summary>
/// Contains the group associations for strings.
/// </summary>
private Hashtable editexGroups;

#endregion

DataGrid.HitTestInfo hitInfo = dg.HitTest(new Point(e.X, e.Y));<br />
if (hitInfo.Row < tCat.Rows.Count && hitInfo.Row > -1)<br />
{<br />
	if (hitInfo.Column == 1)<br />
{<br />
dg.CurrentCell = new DataGridCell(hitInfo.Row,hitInfo.Column);<br />
DataGridCell dc = dg.CurrentCell;<br />
string txt = dg[dc].ToString();<br />
<br />
if (txt.Length > 10)<br />
{<br />
tt.AutoPopDelay = 3000;<br />
tt.InitialDelay = 2000;<br />
tt.ReshowDelay = 3000;<br />
tt.SetToolTip(dg, txt);<br />
tt.Active = true; 				<br />
}<br />
else {tt.Active = false;}<br />
}<br />
else {tt.Active = false;}<br />
}