Search Grid with .NET DataGrid

[CSDProgrammers]

I have a standard .NET DataGrid that is bound to a DataView. When the user
types into a text box above the DataGrid I issue the following code:

try
{
// We need to search for whatever the user is typing based on the type of
search ...
if (this.txtValue. Text.Length == 0)
{
this.UnHighligh tRow();
return;
}

if (this.cbSrhBy.S electedIndex.Eq uals(3))
return;

string lcSort = this.SrchFields[cbSrhOn.Selecte dIndex].ToString().Tri m(),
lcValue = this.ConvertVal ue(this.txtValu e.Text.Trim());
DataRow[] laRows = null;

switch (this.cbSrhBy.S electedIndex)
{
case 0: // Start of Field
if (lcValue.IndexO f("'").Equals (-1))
lcValue += "%";
else
lcValue = lcValue.Insert( lcValue.Length - 1, "%");

laRows = this.dsSearch.T ables[0].Select(lcSort + " LIKE " + lcValue,
lcSort);

break;

case 1: // Exact Phrase
laRows = this.dsSearch.T ables[0].Select(lcSort + " = " + lcValue, lcSort);

break;

case 2: // Any Part of Field
if (lcValue.IndexO f("'").Equals (-1))
lcValue = "%" + lcValue + "%";
else
lcValue = lcValue.Insert( lcValue.Length - 1, "%").Insert (1, "%");

laRows = this.dsSearch.T ables[0].Select(lcSort + " LIKE " + lcValue,
lcSort);

break;

case 3: // Filter Results
return;
}

if (laRows == null || laRows.Length.E quals(0))
return;

DataView loView = this.dsSearch.T ables[0].DefaultView;

this.UnHighligh tRow();
this.dataGrid_R esults.CurrentR owIndex = loView.Find(laR ows[0][lcSort]);
this.HighlightR ow();

this.txtValue.F ocus();
}
catch (Exception loExcep)
{
SharedCode.Erro rMessage(loExce p.ToString());
}

This UnHighlightRow and HighlightRow simply issue Unselect() and Select() on
the CurrentRowIndex .

What happens is when I search on a particular value, like let's say
"Last_Name" and I type in "SMI", it will go to the Smith's but it may not
choose the first one that is shown in the DataGrid when the Find() method is
issued. Why?

Mike