如何從datagridview刪除選定的行

Question

每當我運行它時，此異常就會出現“當nvarchar值'columnvalue'轉換為數據類型int時轉換失敗。” 知道為什么嗎？ 這也是刪除行的永久方法嗎？ 感謝您未來的建議！

 Dim dataindex As Integer = Me.DataGridView1.CurrentRow.Index
    Try
        con = New SqlConnection
        con.ConnectionString = Login.constring
        Dim cmd As New SqlCommand("DELETE FROM tblmovies where movietitle = @a ", con)
        cmd.Parameters.Add(New SqlParameter("@a", dataindex))
        con.Open()
        If MessageBox.Show("Do you really want to Delete this Record?", "Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) = DialogResult.Yes Then
            cmd.ExecuteNonQuery()
            con.Close()

            Exit Sub
        Else
            con.Close()
            Exit Sub
        End If
    Catch ex As SqlException
        MessageBox.Show(ex.Message)
    End Try 

Answer 1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim i As Integer = DataGridView1.SelectedRows(0).Index
    DataGridView1.Rows.RemoveAt(i)
End Sub