How to delete data in database using grid view in vb.net - asp.net

Question

I'm a beginner in vb.net. Currently I'm develop a simple application by using a grid view. however, I'm facing a problem in deleting the data. When I click delete button, it keep adding the blank line. and this blank line is affected my database also. and this blank line also can't be deleted from database manually.
here my code behind
`Imports System.Data.SqlClient
Imports System.Drawing
Imports System.Data
Imports System.Configuration
Imports System.Linq
Partial Class test2
Inherits System.Web.UI.Page
Dim AMS As String = System.Web.Configuration.WebConfigurationManager.ConnectionStrings("AMS").ConnectionString
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
If Not IsPostBack Then
Me.BindData()
End If
End Sub
Private Sub BindData()
Dim dt As DataTable = New DataTable
Dim strConnString As String = ConfigurationManager.ConnectionStrings("AMS").ConnectionString
Using con As SqlConnection = New SqlConnection(strConnString)
Dim strQuery As String = "SELECT * FROM ModuleDetail"
Using cmd As SqlCommand = New SqlCommand(strQuery)
Dim sda As SqlDataAdapter = New SqlDataAdapter
cmd.Connection = con
con.Open()
sda.SelectCommand = cmd
sda.Fill(dt)
GridView1.DataSource = dt
GridView1.DataBind()
End Using
End Using
End Sub
Protected Sub GridView1_RowDeleting(ByVal sender As Object, ByVal e As GridViewDeleteEventArgs)
Dim IsDeleted As Boolean = False
Dim ModuleID As String = Convert.ToInt32(GridView1.DataKeys(e.RowIndex).Value.ToString())
Dim ModuleName As Label = CType(GridView1.Rows(e.RowIndex).FindControl("lblModuleName"), Label)
Dim SubModule As Label = CType(GridView1.Rows(e.RowIndex).FindControl("lblSubModule"), Label)
Dim strConnString As String = ConfigurationManager.ConnectionStrings("AMS").ConnectionString
Using con As SqlConnection = New SqlConnection(strConnString)
Using cmd As SqlCommand = New SqlCommand
cmd.CommandType = CommandType.Text
cmd.CommandText = "DELETE FROM ModuleDetail WHERE ModuleID=#ModuleID"
cmd.Parameters.AddWithValue("#ModuleID", ModuleID)
cmd.Connection = con
con.Open()
IsDeleted = cmd.ExecuteNonQuery() > 0
con.Close()
GridView1.DataSource = cmd
GridView1.DataBind()
End Using
End Using
If IsDeleted Then
lblMsg.Text = "'" & SubModule.Text & "' details has been deleted successfully!"
lblMsg.ForeColor = System.Drawing.Color.Green
BindData()
Else
lblMsg.Text = "Error while deleting '" & SubModule.Text & "' details"
lblMsg.ForeColor = System.Drawing.Color.Red
End If
End Sub
`
I have try a few code from others sources but it shows the same logic error which keep adding the blank line. I hope you guys can help me to solve the issue.

Answer 1

Though it might not relevant to your problem context, but I have observed a couple of issues from your code:
1) It seems you are binding grid twice after row delete.
2) Try commenting following lines since you already calling BindData() whithin IsDeleted flag check.
GridView1.DataSource = cmd;
GridView1.DataBind();
3) You are assigning the 'Command' object: cmd to the Grid's datasource which is not correct. Check your BindData(...) method how you need to bind Grid actually.