getting alert after navigating back to to previous page asp.net

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Hi All,

i have written compare validation for two textboxes,first time i give wrong inputs and i will get alert message which i have given,second time i will give valid inputs and navigate to next page,when i navigate back to previous page using browser back button i once again get that alert message?but i dont want that to happen,How to do that

C#

<asp:CompareValidator ID="CompareValidator1" ControlToValidate="txtFromDate"
               ControlToCompare="txtToDate" Display="Dynamic" runat="server"
               ErrorMessage="To Date should be Greater than From Date" Operator="LessThan"
               Type="Date" Font-Size="Small" >

this is compare validation

C#

protected void btnOk_Click(object sender, EventArgs e)
       {
               if (Validate()) //this method makes sure the textboxes are not empty
               {
                   string Data = combo.SelectedItem.Text;
                   string FromDate = txtFromDate.Text;
                   string ToDate = txtToDate.Text;
                   if (ValidateNoOfDays(Data, FromDate, ToDate))
                   {
                       try
                       {
                           Session["Data"] =Data;
                           Session["FromDate"] = FromDate;
                           Session["ToDate"] = ToDate;

                           Response.Redirect("Show.aspx");
                       }
                       catch (Exception ex)
                       {
                           Response.Write(ex.Message);
                       }
                   }
               }
           }

C#

private bool ValidateNoOfDays(string data, string FromDate, string ToDate)
       {
           bool Valid = true;
           try
           {
               string myStringVariable = "";
               DateTime F_Date = Convert.ToDateTime(FromDate);
               DateTime T_Date = Convert.ToDateTime(ToDate);
               switch (data)
               {
                   case "Week":
                       TimeSpan _WeekT = T_Date.Subtract(F_Date);
                       if ((_WeekT.Days) > 7)
                       {
                           Valid = false;
                           myStringVariable = "Week Cannot have more than 7 days";
                           ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('" + myStringVariable + "');", true);

                       }
                       break;

                   case "Month":
                       TimeSpan _MonthT = T_Date.Subtract(F_Date);
                       if ((_MonthT.Days) > 30)
                       {
                           Valid = false;
                           myStringVariable = "Month Cannot have more than 30 days";
                           ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('" + myStringVariable + "');", true);
                       }
                       break;


                   case "Year":
                       TimeSpan _YearT = T_Date.Subtract(F_Date);
                       if ((_YearT.Days) > 365)
                       {
                           Valid = false;
                           myStringVariable = "year Cannot have more than 365 days";
                           ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('" + myStringVariable + "');", true);
                       }
                       break;
               }
           }
           catch (Exception ex)
           {

           }
           return Valid;
       }

Posted 19-Oct-11 18:10pm

girish sp

Updated 19-Oct-11 22:51pm

v2

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sgjoshi85 · Answer 1 · 2011-10-19T18:17:00

Solution 1

when you click back button, in its button click event, clear text of both textboxes...like -

TextBox1.Text = "";
TextBox2.Text = "";

Posted 19-Oct-11 18:17pm

sgjoshi85

Comments

girish sp 20-Oct-11 0:38am

you mean back button of browser??because it happened when i clicked browser back button,no back button in my application.thanks for your reply

sgjoshi85 20-Oct-11 0:40am

clear these textboxes on page_load() of your page..where you have these textboxes..

girish sp 20-Oct-11 3:22am

if i clear those textboxes in pageload later i cannot read the dates in button click event of that page,it will be null and i will get exception

sgjoshi85 · Answer 2 · 2011-10-19T21:31:00

Solution 2

XML

which textbox you are validating first? I assume you set ControlToValidate = 2nd textbox..

Here is the code i tried and working fyn..
On First.aspx --
 <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:CompareValidator ID="CompareValidator1" ControlToValidate="TextBox2" ControlToCompare="TextBox1" Operator="Equal" runat="server" ErrorMessage="No Match!"></asp:CompareValidator>
        <br />
        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        <br />
        <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />

On button_Click event, it redirects to Second.aspx page... now from here when i click browser's back arrow..it doesn't shown me alert message...

Try out this!

Posted 19-Oct-11 21:31pm

sgjoshi85

Comments

girish sp 20-Oct-11 3:39am

sure i will do this and mark as solved if it works, and thanks very much for your valuable answer.

girish sp 20-Oct-11 4:38am

hi,
this control validation part was working fine,after user enters inputs i will take the difference between two textboxes(of type date),if the diff is greater than some value i will give alert.later user enters values whose diff is within that range and click ok,it will take him to next page,now upon back button i am getting

girish sp 20-Oct-11 4:39am

i will post sample code i am doing ,may be then you will get idea what i am trying to do..

sgjoshi85 20-Oct-11 4:40am

ya plz copy ur sample code..

girish sp 20-Oct-11 4:52am

hi,check out..i have pasted my code