C# tutorial: a Simple Dictionary-Make search box workable


Dictionary: Make search box workable



To make the search box workable you need the following code that is applied to the TextChanged event of the text box:

private void Txtbox_TextChanged(object sender, EventArgs e)
{
int i;
DataRow dr;
try
{
for (i = 0; i <= Lstterms.Items.Count - 1; i++)
{

if (Txtbox.Text.Trim().ToUpper() == Lstterms.Items[i].ToString().ToUpper().Substring(0, Txtbox.TextLength))
{
//Select matched term
Lstterms.SelectedIndex = i;
//Display translation
dr = rs.Tables[0].Rows[i];
Txtresult.Clear();
Txtresult.Text = dr[1].ToString().Trim();
highlight();
break;
}
}
}
catch (Exception ex) { }
}

When a user types a word in the search text box TxtBox, This word is used to compare with a word in the list box. If the words are matched the word in the list will be selected and its translation will display in the rich text box Txtresult. The highlight() procedure is called to change colors of the English key terms in the rich text box Txtresult. This procedure will be discussed in the next phase.

If the use chooses to select from the list rather than typing in to the search box, you need another piece of code applied to the SelectedIndexChanged event of the list box:

private void Lstterms_SelectedIndexChanged(object sender, EventArgs e)
{

DataRow dr;
dr = rs.Tables[0].Rows[Lstterms.SelectedIndex];
Txtresult.Clear(); //clear result
Txtresult.Text =dr[1].ToString().Trim ();
highlight();

}

Note: The DataRow dr is used to get data of a selected row of the table.






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