how to take value from gridview cell using vb.net

hi Kl baiju,
Following is your solution and please mark my answer as accepted if it helped you :)

1. Following is your aspx file code:


first you need to add Command name and Command argument to the row.
The value for the CommandName can be "Edit"
The value for the CommandArgument =' <%#Container.DataItemIndex %>'
Generate onRowCommand event for your grid
OnRowCommand="sampleGrid_RowCommand"
On RowCommand event of the grid you can get the index of the grid and then you can load values using that index.


2. following is row command code for you .vb file  
Protected Sub SampleGrid_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles SampleGrid.RowCommand
        If e.CommandName = "Edit" Then
            Load_Data_To_TextBox(e.CommandArgument)
        End If
    End Sub
    Private Sub Load_Data_To_TextBox(ByVal index As Integer)
        'Get data using index of clicked row and show it in textbox
    End Sub

If you are not clear with aspx code then please post your aspx grid code also. I will give aspx code also.