清除數據表

Question

我試圖刷新數據表後點擊按鈕後的新內容，但它也再次顯示以前的值。我想明確的（），但我怎麼能刷新的datagridview顯示我每次點擊按鈕後，我切換日期時間數據它不適合我

protected void btnListItems_Click(object sender, EventArgs e) 
{ 
    lblMessage.Visible = false; 
    //lblEnddatse.Visible = true; 
    Boolean status = true; 
    Util objUtil = new Util(); 
    String Message = ""; 
    DateTime SDate = new DateTime(); 
    DateTime EDate = new DateTime(); 
    string str = ""; 
    DataTable tbl = new DataTable(); 
    DataTable dt = new DataTable(); 
    DataRow dr; 
    String[] s1; 
    dt.Clear(); 

    //DirectoryInfo d = new DirectoryInfo(); 
    s1 = Directory.GetFiles(@"C:/TextFiles"); 

    for (int i = 0; i <= s1.Length - 1; i++) 
    { 
     if (i == 0) 
     { 
      //Add Data Grid Columns with name 
      dt.Columns.Add("FileName"); 
      dt.Columns.Add("GeneratedTime"); 
     } 
     //Get each file information 
     FileInfo f = new FileInfo(s1[i]); 
     FileSystemInfo f1 = new FileInfo(s1[i]); 
     dr = dt.NewRow(); 
     //Get File name of each file name 
     dr["FileName"] = f1.Name; 
     dr["GeneratedTime"] = f1.CreationTime.Date.ToString("dd/MM/yyyy"); 
     string a = f1.CreationTime.Date.ToString("dd/MM/yyyy"); 
     //Insert collected file details in Datatable 
     string fromdate = txtFromDate.Text.ToString(); 
     string todate = txtToDate.Text.ToString(); 

     if ((DateTime.ParseExact(a.ToString(),"dd/MM/yyyy",System.Globalization.CultureInfo.InvariantCulture)) >= DateTime.ParseExact(fromdate.ToString(),"dd/MM/yyyy",System.Globalization.CultureInfo.InvariantCulture)) 
     { 

     if ((DateTime.ParseExact(a.ToString(), "dd/MM/yyyy", System.Globalization.CultureInfo.InvariantCulture)) <= DateTime.ParseExact(todate.ToString(), "dd/MM/yyyy", System.Globalization.CultureInfo.InvariantCulture)) 
     { 
     dt.Rows.Add(dr); 
     } 
     } 


     if ((f.Length/1024) > 5000) 
     { 
      lblMessage.Text = "" + f1.Name + " had reach its size limit."; 
     } 
     else 
     { } 

    } 
    if (dt.Rows.Count > 0) 
    { 
     gvFileGenStatus.DataSource = dt; 
     gvFileGenStatus.DataBind(); 
    } 

} 

工作。 感謝提前的幫助..

Answer 1

嘗試：

gvFileGenStatus.Rows.Clear(); 

Answer 2

dt.Dispose(); 

or in 

DataTable dt_null = new DataTable(); 

if (dt.Rows.Count > 0) 
{ 
    gvFileGenStatus.DataSource = dt_null; 
    gvFileGenStatus.DataBind(); 
}