Dynamic Search in Windows Application

Please follow the below code,how it is working to search Dynamically.
it will filter all the data corresponding to the textbox entering characters.
1. Drag a Text Box and a DataGridView.
VB Code
[Code]
Public Class frmDynamicSearch
Dim ds As DataSet
Dim _dt As DataTable
Public _strDynamicSearchColumn As String = "UserName"
Dim FindGridTable As DataTable
Dim dtSearchResult As DataTable
Public Property DynamicSearchColumn() As String
Get
Return _strDynamicSearchColumn
End Get
Set(ByVal value As String)
_strDynamicSearchColumn = value
End Set
End Property
Private Function DynamicSearch() As DataTable
Try
If txtUserName.Text.Trim.Equals(String.Empty) Then
Return FindGridTable
End If
dtSearchResult.Rows.Clear()
Dim dr() As DataRow = Nothing
Dim rowSearchResult As DataRow
For Each row As DataRow In FindGridTable.Rows
If Not IsDBNull(row(DynamicSearchColumn)) Then
If row(DynamicSearchColumn).ToString().Trim.ToUpper.StartsWith(txtUserName.Text.Trim.ToUpper) Then
rowSearchResult = dtSearchResult.NewRow()
rowSearchResult.ItemArray = row.ItemArray
dtSearchResult.Rows.Add(rowSearchResult)
End If
End If
Next
Catch ex As Exception
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try
Return dtSearchResult
End Function

Private Sub txtCode_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtUserName.TextChanged
Dim dt As DataTable = DynamicSearch()
If Not dt Is Nothing And dgvDisplay.RowCount > 0 Then
dgvDisplay.DataSource = dt
Else
MessageBox.Show("No Records Available", "Santosh Test", MessageBoxButtons.OK, MessageBoxIcon.Information)
End If
End Sub
Private Sub frmDynamicSearch_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
ds = clsDBManager.FillDataSet("Select * from tbUserMst")
If Not ds.Tables(0) Is Nothing AndAlso ds.Tables(0).Rows.Count > 0 Then
dgvDisplay.DataSource = ds.Tables(0)
_strDynamicSearchColumn = "UserName"
FindGridTable = ds.Tables(0).Copy
dtSearchResult = ds.Tables(0).Copy
Else
MessageBox.Show("No Records Available", "Santosh Test", MessageBoxButtons.OK, MessageBoxIcon.Information)
End If
End Sub
End Class
[/Code]

C# Code
[Code]
public class frmDynamicSearch
{
private DataSet ds;
private DataTable _dt;
public string _strDynamicSearchColumn = "UserName";
private DataTable FindGridTable;
private DataTable dtSearchResult;
//TODO: INSTANT C# TODO TASK: Insert the following converted event handler wireups at the end of the 'InitializeComponent' method for forms, 'Page_Init' for web pages, or into a constructor for other classes:
txtUserName.TextChanged += txtCode_TextChanged;
base.Load += frmDynamicSearch_Load;

public string DynamicSearchColumn
{
get
{
return _strDynamicSearchColumn;
}
set
{
_strDynamicSearchColumn = value;
}
}
private DataTable DynamicSearch()
{
try
{
if (txtUserName.Text.Trim().Equals(string.Empty))
{
return FindGridTable;
}
dtSearchResult.Rows.Clear();
DataRow[] dr = null;
DataRow rowSearchResult = null;
foreach (DataRow row in FindGridTable.Rows)
{
if (! (System.Convert.IsDBNull(row[DynamicSearchColumn])))
{
if (row[DynamicSearchColumn].ToString().Trim().ToUpper().StartsWith(txtUserName.Text.Trim().ToUpper()))
{
rowSearchResult = dtSearchResult.NewRow();
rowSearchResult.ItemArray = row.ItemArray;
dtSearchResult.Rows.Add(rowSearchResult);
}
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
return dtSearchResult;
}

private void txtCode_TextChanged(object sender, System.EventArgs e)
{
DataTable dt = DynamicSearch();
if (dt != null & dgvDisplay.RowCount > 0)
{
dgvDisplay.DataSource = dt;
}
else
{
MessageBox.Show("No Records Available", "Santosh Test", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
private void frmDynamicSearch_Load(object sender, System.EventArgs e)
{
ds = clsDBManager.FillDataSet("Select * from tbUserMst");
if (ds.Tables[0] != null && ds.Tables[0].Rows.Count > 0)
{
dgvDisplay.DataSource = ds.Tables[0];
_strDynamicSearchColumn = "UserName";
FindGridTable = ds.Tables[0].Copy();
dtSearchResult = ds.Tables[0].Copy();
}
else
{
MessageBox.Show("No Records Available", "Santosh Test", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
[/Code]

OutPut:
How was the Coding ???
Plz post a comment

Thanx and Regards
Santosh
http://santoshdotnetarena.blogspot.com/