How to select a record in the datagrid and start editing/updating the record using textboxes

<asp:DataGrid id='DataGrid1' OnItemCommand='ItemCommand' 
style='Z-INDEX: 101; LEFT: 15px; POSITION: absolute; TOP: 23px'
 runat='server'  >
	<Columns>
		<asp:ButtonColumn Text='Edit' ButtonType='PushButton' CommandName='Edit'>
</asp:ButtonColumn>
	</Columns>
</asp:DataGrid>
<asp:TextBox id='txtRegionID' style='Z-INDEX: 102; LEFT: 352px; POSITION: absolute; TOP: 24px'
	runat='server'></asp:TextBox>
<asp:TextBox id='txtRegionDescription' style='Z-INDEX: 103; LEFT: 352px; POSITION: absolute; TOP: 64px'
	runat='server'></asp:TextBox>
<asp:Button id='btnUpdate' style='Z-INDEX: 104; LEFT: 304px; POSITION: absolute; TOP: 128px'
	runat='server' Text='Update'></asp:Button>
<asp:Label id='lblMessage' style='Z-INDEX: 105; LEFT: 296px; POSITION: absolute; TOP: 176px'
	runat='server'></asp:Label>

VB.NET

Dim cn As SqlConnection
Dim da As SqlDataAdapter
Dim cmd As SqlCommand
Dim strsql As String
Dim ds As DataSet

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
	’Put user code to initialize the page here
	cn = New SqlConnection('Server=localhost;uid=sa;pwd=;database=northwind;')
	If Not Page.IsPostBack Then
		BindData()
	End If
End Sub

Sub BindData()
	DataGrid1.DataSource = GetData('Select * from Region')
	DataGrid1.DataBind()
End Sub

Function GetData(ByVal strSql As String) As DataSet
	da = New SqlDataAdapter(strSql, cn)
	ds = New DataSet()
	da.Fill(ds)
	Return ds
End Function

Protected Sub ItemCommand(ByVal source As Object, _
 ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs)
 	If e.CommandName = 'Edit' Then
	’Fill the Textboxes with relevant data
		FillTheData(e.Item.Cells(1).Text, e.Item.Cells(2).Text)
	End If
End Sub

Sub FillTheData(ByVal RegionID As String, ByVal RegionDescription As String)
	txtRegionID.Text = RegionID
	txtRegionDescription.Text = RegionDescription
End Sub

Private Sub btnUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpdate.Click
Try
	strsql = 'Update Region set RegionDescription=@RegionDescription where RegionId=@RegionId'
	cmd = New SqlCommand(strsql, cn)
	cmd.Parameters.Add(New SqlParameter('@RegionId', SqlDbType.Int))
	cmd.Parameters.Add(New SqlParameter('@RegionDescription', SqlDbType.NVarChar, 40))
	cmd.Parameters('@RegionId').Value = Convert.ToInt32(txtRegionID.Text)
	cmd.Parameters('@RegionDescription').Value = txtRegionDescription.Text
	cn.Open()
	cmd.ExecuteNonQuery()
	BindData()
	lblMessage.Text = 'Updated Successfully'
Catch ex As Exception
	lblMessage.Text = ex.Message
	lblMessage.ForeColor = Color.Red
Finally
	cn.Close()
End Try
End Sub

C#

SqlConnection cn; 
SqlDataAdapter da ; 
SqlCommand cmd ; 
string strsql ;	
DataSet ds ; 
private void Page_Load(object sender, System.EventArgs e)
{
	// Put user code to initialize the page here
	cn = new SqlConnection('Server=localhost;uid=sa;pwd=;database=northwind;');
	if(!Page.IsPostBack)
	{
		//Code to Bind the data to the Datagrid
		BindData();
	}
}

void BindData()
{
	DataGrid1.DataSource = GetData('Select * from Region');
	DataGrid1.DataBind();
}
DataSet GetData(string strSql) 
{
	da = new SqlDataAdapter(strSql, cn);
	ds = new DataSet();
	da.Fill(ds);
	return ds;
}

protected void ItemCommand(Object source,System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
	if (e.CommandName == 'Edit')
	{
		//’Fill the Textboxes with relevant data
		FillTheData(e.Item.Cells[1].Text, e.Item.Cells[2].Text);
		lblMessage.Text=''; 
	}
}	

void FillTheData(string RegionID,string RegionDescription)
{
	txtRegionID.Text = RegionID;
	txtRegionDescription.Text = RegionDescription;
}
		
private void btnUpdate_Click(object sender, System.EventArgs e)
{
try
{
	strsql = 'Update Region set RegionDescription=@RegionDescription where RegionId=@RegionId';
	cmd = new SqlCommand(strsql, cn);
	cmd.Parameters.Add(new SqlParameter('@RegionId', SqlDbType.Int));
	cmd.Parameters.Add(new SqlParameter('@RegionDescription', SqlDbType.NVarChar, 40));
	cmd.Parameters['@RegionId'].Value = Convert.ToInt32(txtRegionID.Text);
	cmd.Parameters['@RegionDescription'].Value = txtRegionDescription.Text;
	cn.Open();
	cmd.ExecuteNonQuery();
	BindData();
	lblMessage.Text = 'Updated Successfully';
}
catch (Exception ex)
{
	lblMessage.Text = ex.Message;
	lblMessage.ForeColor = Color.Red;
}													  
finally
{
	cn.Close();
}
}