How Can I Save The Contents Of The Selected Tabpage In A Tabcontrol In A Xml File In C#?

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Hi,

I have a tabControl in which tabPages are created at run-time. Every TabPage contains a TextBox and a DataGridView of the same format.
Now i have a save button which should save the content(values in textbox and datagridview) of the current tab in an xml file.
But whenever i am saving the values, the content of the first tabPage is getting saved all the time. I know that i need to use TabControl.SelectedTab property but i am not able to write the code for it.
Using the code below, i get the following error "Object refernce not set to an instance of the object"

C#

DataGridView dgv = null;
            if (profileTabControl.SelectedTab.Controls.ContainsKey("dgvIsland"))
            {
                dgv = (DataGridView)profileTabControl.SelectedTab.Controls["dgvIsland"];
            }
            DataTable dt = new DataTable();
            foreach (DataGridViewColumn col in dgv.Columns)
            {
                dt.Columns.Add(col.HeaderText);
            }
            foreach (DataGridViewRow row in dgv.Rows)
            {
                DataRow dRow = dt.NewRow();
                foreach (DataGridViewCell cell in row.Cells)
                {
                    dRow[cell.ColumnIndex] = cell.Value;
                }
                dt.Rows.Add(dRow);
            }
            DataSet ds = new DataSet();
            ds.Tables.Add(dt);
            ds.WriteXml(filename);

Can anyone please help in atleast letting me know about how to start with the above problem?

Thanks :)

Posted 9-Jun-14 2:16am

sovit agarwal

Updated 9-Jun-14 3:07am

v2

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Comments

Suvabrata Roy 9-Jun-14 8:19am

You need save only selected Tab or ALL?

sovit agarwal 9-Jun-14 8:25am

I will be saving all the tabs individually, i.e. if tabPage1 is opened currently then by clicking on SAVE only the current tab will be saved....
Next if TabPage3 is selected, then pressing SAVE button will save the contents of TabPage3 only

Suvabrata Roy 9-Jun-14 8:28am

Ok, so u need to save selected tab.
Are using AjaxToolKit ?

sovit agarwal 9-Jun-14 8:38am

No, i am using Winforms

ZurdoDev 9-Jun-14 8:27am

Please click Improve Question and show us the code you have and why SelectedTab is not working for you.

[no name] 9-Jun-14 9:09am

Of course you are getting that error, you have set dvg to be null.

sovit agarwal 9-Jun-14 9:14am

i just figured it out....what should it be then set to?

[no name] 9-Jun-14 9:17am

Try something other than null. What do you think is going to happen if the selected tab is not the one you are specifically looking for?

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*Suvabrata Roy* · Answer 1 · 2014-06-09T03:05:00

Hi,

so with in the save event you can get the current tab

C#

TabControl.SelectedTab

but your challenge would be something different that is how you will find each DataGrid and TextBox because each object name would be different.

Solution :

C#

foreach(Control Clt in [Your Tab ID].SelectedTab.Controls)
{
   if(Clt is TextBox)
   {
       // Use your operation 
   }
   if(Clt is DataGridView)
   {
      // Use your operation  
   }
}

Thanks
Suvabrata