感謝大大的分享

大大我照範例實作能從資料庫刪除資料了，但是每次都只從第一筆開始刪(例如：要刪第3筆結果都從第1筆開始刪)不知道哪邊出錯了@@

.aspx

 <script language="javascript" type="text/javascript">
        var CustomerID = null;
        var CompanyName = null;

$(document).ready(function () {
$(".customerRow").contextMenu({ menu: 'myMenu' }, function (action, el, pos) { contextMenuWork(action, el, pos); });
$(".openmenu").contextMenu({ menu: 'myMenu', leftButton: true }, function (action, el, pos) { contextMenuWork(action, el.parent("tr"), pos); });
        });

function contextMenuWork(action, el, pos, val) {
   var rowindex = (el[0].rowIndex * 1 - 1);
   UserID = $('[id*=lblUser_name]').html();
   ModuleName = $('[id*=lblUserModule_name]').html();
   switch (action) {
        case "delete":
        {
          var msg = "Delete " + ModuleName + "?";   
          confirm(msg);
          break;
        }
        case "insert":
        {
           alert("Insert");
           break;
        }
        case "edit":
        {
           alert("Edit");
           break;
        }
}
  $.ajax({
         type: "POST",
         url: "mainpage.aspx/DeletegvEmpData",
         data: '{UserModuleName: "' + ModuleName + '"}',
         contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: OnSuccess,
                failure: function (response) {
                    alert(response.d);
                }
            });
        }

        function OnSuccess(response) {
            alert(response.d);
        } 
        
function pageLoad() {
$(".customerRow").contextMenu({ menu: 'myMenu' }, function (action, el, pos) { contextMenuWork(action, el, pos); });
$(".openmenu").contextMenu({ menu: 'myMenu', leftButton: true }, function (action, el, pos) { contextMenuWork(action, el.parent("tr"), pos); });
        }
    </script>

.cs

protected void UserModuleGridView_RowDatabond(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            DataTable dt = new DataTable();
            dt = (DataTable)UserModuleGridView.DataSource;
            int rowindex = e.Row.RowIndex;
            e.Row.Attributes.Add("class", "customerRow");
        }
    }
    
 [System.Web.Services.WebMethod]
 public static string DeletegvEmpData(string UserModuleName)
{
        string strmsg = string.Empty;
string constr = ConfigurationManager.ConnectionStrings["lseformsConnectionString"].ConnectionString;
using (SqlConnection con = new SqlConnection(constr))
   {
      SqlCommand cmd = new SqlCommand("Delete [Antibiotic] 
      where UserModule_name=@UserModule_name", con);
      con.Open();
      cmd.Parameters.AddWithValue("@UserModule_name",
      UserModuleName);
      int retval = cmd.ExecuteNonQuery();
      con.Close();
            
      if (retval == 1)
         strmsg = "true";
      else
         strmsg = "false";
         return strmsg;
        }
}

=@UserModule_name 要看你傳到後端的UserModule_name是不是你要刪的那筆吧～c#可以開debug很好查，不像其他語言