Dynamically create datable row going to clear automatically.

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Hello
sorry for ununderstandable title.
I work on asp.net website in this i need to create dynamic datatable. in this there one button and on button click event i have to add one row in datatabel.at every time button click event fired i have to append one more row in datatable.
For that i do this code.

C#

//Form load event datatable initialize.

    DataTable dt = new DataTable();
    DataRow dtrow;
    protected void Page_Load(object sender, EventArgs e)
    {
        
            dt.Columns.Add("Productid", typeof(string));
            dt.Columns.Add("ProductName", typeof(string));
            dt.Columns.Add("ProductsubName", typeof(string));
            dt.Columns.Add("UnitPrice", typeof(string));
            dt.Columns.Add("Qyt", typeof(string));
            dt.Columns.Add("TotalAmount", typeof(string));
             
        
    }
//now on button click event

    protected void btnAdd_Click(object sender, EventArgs e)
    {
        string id = ComboBox2.SelectedItem.Value.ToString();
        dataBind objdata = new dataBind();
        DataTable dtprod= objdata.viewdata("Select * from product_master where sno='"+id+"'");

        dtrow = dt.NewRow();
           // Create New Row
        dtrow["Productid"] = id;            //Bind Data to Columns
        dtrow["ProductName"] = dtprod.Rows[0]["prod_type"];
        dtrow["ProductsubName"] = dtprod.Rows[0]["prod_sub_type"];
        dtrow["UnitPrice"] = dtprod.Rows[0]["rate"];
        dtrow["Qyt"] = txtqty.Text.ToString();
        dtrow["TotalAmount"] = dtprod.Rows[0]["rate"];
        dt.Rows.Add(dtrow);

        GridView1.DataSource = dt; //Bind the gridview with datatable.
        GridView1.DataBind();

}

Now problem is for 1st time button click it's work fine but when i click button on second time datatable gonig to clear and only new data row is inserted. but actually i want to append row in datatable

please help me to solve out this.

Posted 29-Sep-13 23:36pm

Archit Patel

Updated 29-Sep-13 23:37pm

v2

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3 solutions

Solution 1

Hi,

Declare the datatable globally and keep the datatable in viewstate.

while every time adding row,add row to datatable of viewstate not to local datatable. between postbacks you will loss the data.

Ex:

DataTable dt=new DataTable()

ViewStatt["OriginalData"]= dt

Did you got it?

Regards,
Kiran.

Posted 29-Sep-13 23:47pm

Kirankumar Ballapalli

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[no name] 30-Sep-13 5:50am

no i can't get.

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Pratik Bhuva · Accepted Answer · 2013-09-29T23:55:00

Use Static Keyword for DataTable and DataRow

C#

static DataTable dt = new DataTable();
static DataRow dtrow;

And also use...

C#

protected void Page_Load(object sender, EventArgs e)
{

     if(!page.IsPostBack)
     {
        dt.Columns.Add("Productid", typeof(string));
        dt.Columns.Add("ProductName", typeof(string));
        dt.Columns.Add("ProductsubName", typeof(string));
        dt.Columns.Add("UnitPrice", typeof(string));
        dt.Columns.Add("Qyt", typeof(string));
        dt.Columns.Add("TotalAmount", typeof(string));
     }

}

Hope This Help

**Azee** · Accepted Answer · 2013-09-30T00:16:00

Hello there,

First:

Wrap your Page_Load code in

C#

if(!page.IsPostBack)
         {}

Second, you need to keep your DataTable in a Session or ViewState object as in the current scenario every button click will create a new DataTable dt object.
So go like this after this:

C#

DataTable dtprod= objdata.viewdata("Select * from product_master where sno='"+id+"'");

line

C#

DataTable dtObj = null;
            if (Session["YourSessionKey"] != null)
            {
                dtObj= (DataTable) Session["YourSessionKey"];
            }
            else
            {
                dtObj = new DataTable();
            }

and use dtObj in the click event instead of dt and after this line :

C#

dt.Rows.Add(dtrow);

add these statements

C#

dtObj.AcceptChanges();
            Session["YourSessionKey"] = dtObj;

Finally, remove this line DataTable dt = new DataTable(); and give your own name to Session key YourSessionKey.

Hope it helps.
Good luck

Azee...

Dynamically create datable row going to clear automatically.

3 solutions

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Solution 1

Solution 3

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