Adding more records to ViewState without Overridding Previous records

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i want to add more records in a viewstate, after compiling to end till DataBind(). the code works fine, but when i again start the process, it remove the previous record from view state, i want view state to be merged not override any ideas..

C#

CheckBox cBox2 = null;
            for (int i = 0; i < lvItemTone2.Items.Count(); i++)
            {
                cBox2 = (CheckBox)lvItemTone2.Items[i].FindControl("lvTone2chckSelect");
                if (cBox2.Checked)
                {
                    ItemCode = ((DropDownList)GridView1.FooterRow.FindControl("ddlItemCode")).SelectedItem.Text.ToString();
                    BatchNo = ((Label)lvItemTone2.Items[i].FindControl("lblBatchNo")).Text;
                    Quantity = ((Label)lvItemTone2.Items[i].FindControl("lblQty")).Text;
                    SelectedQuantity = ((Label)lvItemTone2.Items[i].FindControl("lblSelQty")).Text;

                    dr = dt.NewRow();
                    dr["ItemCode"] = ItemCode;
                    dr["BatchNo"] = BatchNo;
                    dr["Quantity"] = Quantity;
                    dr["SelectedQuantity"] = SelectedQuantity;
                    
                    if (dr != null)
                    {
                        dt.Rows.Add(dr);
                    }
                }
            }
            ViewState["BatchTable"] = dt;
            lvItemTone2.DataSource = dt;
            lvItemTone2.DataBind();

Posted 6-Oct-13 23:45pm

xibit89

Updated 6-Oct-13 23:48pm

Azee

v2

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Comments

xibit89 7-Oct-13 5:49am

Azee what u have Edited?

Azee 7-Oct-13 5:52am

Just the formatting, nothing to worry :)

xibit89 7-Oct-13 6:01am

Okay. :)

5 solutions

Solution 2

Hey there,

You need check if the DataTable exists in the ViewState, if yes then use that one instead of creating a new one every time. Use something like this after creating the DataTable object somewhere above for loop (You didn't post that part), that way will adding Rows to previously saved DataTable in the ViewState:

C#

if(ViewState["BatchTable"] != null)
{
    dt = (DataTable)ViewState["BatchTable"];
}

Hope it helps, do let me know if it isn't what you were looking for.

Azee...

Posted 6-Oct-13 23:52pm

Azee

Updated 6-Oct-13 23:54pm

v2

Solution 1

1. copy the viewstate previous data into a datatable named(preDt).
2. merge the new datatable (newDt) with preDt.
3. now set the output result to view state.

Posted 6-Oct-13 23:52pm

S.P.Tiwari

v2

Comments

xibit89 7-Oct-13 6:11am

can u tell how to copy previous data?

Solution 3

create your viewstate at load time like this

C#

protected void Page_Load(object sender, EventArgs e)
       {
if (!IsPostBack)
           {
datatatle dt=new DataTable();
dt.column.add("BatchNo");
dt.column.add("ItemCode");
dt.column.add("Quantity");
dt.column.add("SelectedQuantity");

ViewState["data"]=dt;
}
}

put your code like this

CheckBox cBox2 = null;
DataTable dt=ViewsState["data"] as DataTable;
            for (int i = 0; i < lvItemTone2.Items.Count(); i++)
            {
                cBox2 = (CheckBox)lvItemTone2.Items[i].FindControl("lvTone2chckSelect");
                if (cBox2.Checked)
                {
                    ItemCode = ((DropDownList)GridView1.FooterRow.FindControl("ddlItemCode")).SelectedItem.Text.ToString();
                    BatchNo = ((Label)lvItemTone2.Items[i].FindControl("lblBatchNo")).Text;
                    Quantity = ((Label)lvItemTone2.Items[i].FindControl("lblQty")).Text;
                    SelectedQuantity = ((Label)lvItemTone2.Items[i].FindControl("lblSelQty")).Text;
 
                    dr = dt.NewRow();
                    dr["ItemCode"] = ItemCode;
                    dr["BatchNo"] = BatchNo;
                    dr["Quantity"] = Quantity;
                    dr["SelectedQuantity"] = SelectedQuantity;
                    
                    if (dr != null)
                    {
                        dt.Rows.Add(dr);
                    }
                }
            }
            //ViewState["BatchTable"] = dt;
            lvItemTone2.DataSource = dt;
            lvItemTone2.DataBind();

this code definitely work for you

Posted 7-Oct-13 0:06am

Abid Shk

Updated 7-Oct-13 0:29am

v2

Solution 4

DataTable dt = (DataTable)ViewState["committeeDetails"];
if (dt.Rows.Count > 0)
{
ViewState["count"] = dt.Rows.Count;

}
else
{
ViewState["count"] = 0;
btnSubmit.Visible = false;
}
//dt.Rows.Clear();

int i = Convert.ToInt16(ViewState["count"]);
//i++;
//dt.NewRow();
DataRow dr1 = dt.NewRow();
DateTime formDate;
DateTime validDate;
string formdate1 = "", validDate1 = "";
if (txtFormationDate.Text == "")
{
formDate = DateTime.ParseExact("01/01/1900", "dd/MM/yyyy", null);
//formdate1 = formDate.ToString("dd/MM/yyyy");
}
else
{
formDate = DateTime.ParseExact(txtFormationDate.Text, "dd/MM/yyyy", null);
// formdate1 = formDate.ToString("dd/MM/yyyy");
}
if (txtValidTill.Text == "")
{
validDate = DateTime.ParseExact("01/01/1900", "dd/MM/yyyy", null);
//validDate1 = validDate.ToString("dd/MM/yyyy");
}
else
{
validDate = DateTime.ParseExact(txtValidTill.Text, "dd/MM/yyyy", null);
// validDate1 = validDate.ToString("dd/MM/yyyy");
}
dr1["ColumnName"] = formDate;
dr1["ColumnName"] = validDate;
dr1["ColumnName"] = txtMemberName.Text;
dr1["ColumnName"] = txtDesignation.Text.Trim();
dr1["ColumnName"] = txtContact.Text.Trim();
dt.Rows.Add(dr1);
ViewState["count"] = i + 1;
ViewState["committeeDetails"] = dt;

grdCommittee.DataSource = (DataTable)ViewState["committeeDetails"];
grdCommittee.DataBind();

Posted 7-Oct-13 0:45am

chitransh635

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xibit89 · Accepted Answer · 2013-10-08T00:02:00

C#

if (ViewState["BatchTable"] != null)
           {
               if (((DataTable)ViewState["BatchTable"]).Rows.Count > 0)
               {
                   dt = (DataTable)ViewState["BatchTable"];
               }
           }
           dr = dt.NewRow();

           for (int i = 0; i < lvItemTone2.Items.Count(); i++)
           {
               ItemCode = ((DropDownList)GridView1.FooterRow.FindControl("ddlItemCode")).SelectedItem.Text.ToString();
               BatchNo = ((Label)lvItemTone2.Items[i].FindControl("lblBatchNo")).Text;
               Quantity = ((Label)lvItemTone2.Items[i].FindControl("lblQty")).Text;
               SelectedQuantity = ((Label)lvItemTone2.Items[i].FindControl("lblSelQty")).Text;

               dr = dt.NewRow();
               dr["ItemCode"] = ItemCode;
               dr["BatchNo"] = BatchNo;
               dr["Quantity"] = Quantity;
               dr["SelectedQuantity"] = SelectedQuantity;

               if (dr != null)
               {
                   dt.Rows.Add(dr);
               }
           }


           ViewState["BatchTable"] = dt;

           lvItemTone2.DataSource =  dt.Select("itemCode = '" + ItemCode + "'").CopyToDataTable();
           lvItemTone2.DataBind();