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RadDatePicker with HtmlTextWriter

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Abhi Shinde asked on 25 Nov 2011, 07:55 AM

Hi,

Problem about : "RadDatePicker"
I am trying to create a html table with "RadDatePicker" dynamically(in code behind) and tried to pass that HTML table as string to jquery.

Its working fine for ASP controls but whenever I tried to add "RadDatePicker" it is giving error.
My code -

[System.Web.Services.WebMethod]

public static string txtNoOfInstallment_OnTextChanged(int noOfInstallments)

{

try

{

Table tab = new Table();

for (int i = 1; i <= noOfInstallments; i++)

{

TableRow tr = new TableRow();

TableCell td1 = new TableCell();

TableCell td2 = new TableCell();

TableCell td3 = new TableCell();

TableCell td4 = new TableCell();

Label lblAmt = new Label();

lblAmt.Text = "Installment" + " " + i;

TextBox txtAmount = new TextBox();

txtAmount.ID = "txtAmount" + i;

Label lblDate = new Label();

lblDate.Text = "Due date";

RadDatePicker dtPickerIstallmentDate = new RadDatePicker();

dtPickerIstallmentDate.ID = "dtPickerIstallmentDate" + i;

td1.Controls.Add(lblAmt);

td2.Controls.Add(txtAmount);

td3.Controls.Add(lblDate);

td4.Controls.Add(dtPickerIstallmentDate);

tr.Cells.Add(td1);

tr.Cells.Add(td2);

tr.Cells.Add(td3);

tr.Cells.Add(td4);

tab.Rows.Add(tr);

}

System.Text.StringBuilder sb = new System.Text.StringBuilder();

System.IO.StringWriter tw = new System.IO.StringWriter(sb);

HtmlTextWriter hw = new HtmlTextWriter(tw);

tab.RenderControl(hw);

return sb.ToString();

}

catch(Exception ex)

{

return ex.Message;

}

At " tab.RenderControl(hw);" this line it is throwing an following error-

{System.NullReferenceException: Object reference not set to an instance of an object.

at Telerik.Web.UI.DatePickingInput.RenderBeginTag(HtmlTextWriter writer)

at System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer)

at Telerik.Web.UI.RadWebControl.Render(HtmlTextWriter writer)

at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)

at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)

at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)

at Telerik.Web.UI.RadDatePicker.AddControlComponents(HtmlTextWriter writer)

at Telerik.Web.UI.RadDatePicker.RenderChildren(HtmlTextWriter writer)

at System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer)

at Telerik.Web.UI.RadWebControl.RenderContents(HtmlTextWriter writer)

at Telerik.Web.UI.RadDatePicker.RenderContents(HtmlTextWriter writer)

at System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer)

at Telerik.Web.UI.RadWebControl.Render(HtmlTextWriter writer)

at Telerik.Web.UI.RadDatePicker.Render(HtmlTextWriter writer)

at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)

at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)

at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)

at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)

at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)

at System.Web.UI.WebControls.TableCell.RenderContents(HtmlTextWriter writer)