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11.21.2007 at 09:41AM PST, ID: 22976044
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8.2

Reading Dynamic controls like DropDownList in C#

Asked by tia_kamakshi in C# Programming Language, Programming for ASP.NET

Tags: ,

Hi,

I am working on C#, ASP.net 2.0

I have created a dynamic dropdown and added in the HTML Table and it displays fine with data.

In the form there is submit button.

on submit click I am not able to find the DropDownList, which I can see is there on the screen

Is there any another way to see the dynamic controls like DropDownList.

I also tried to see all the controls present from

string idIs = string.Empty;
foreach (Control c in pnlMain.Controls)
{
            idIs =  c.ID;
}

It gives me all null valuse

Why?? How can I get the values from dynamic controls

Here is mu code below:


On click on button



protected void btnSubmit_Click(object sender, EventArgs e)
{
        DropDownList SecurityQuestionDrp = (DropDownList)this.FindControl("SecurityQuestion"); // SecurityQuestion is the dynamic ID

        string strDrp = SecurityQuestionDrp.SelectedValue;
}



// Generates Dynamic dropdownlist and add to the html table DynamicTable after row 6

private void GetDynamicHTML()
    {
        oDynmcFld = new DynamicFieldBL();
        DataSet oDst = oDynmcFld.GetFieldsByFormId("GetFieldsByFormId", 1);
        oDst.Relations.Add("ControlValuesRelation", oDst.Tables[0].Columns["FieldId_PK"], oDst.Tables[1].Columns["FormFileds_Mstr_PK"]);
       
        DataTable oDt = oDst.Tables[0];

       HtmlTableRow htr = new HtmlTableRow();
       HtmlTableCell htc1 = new HtmlTableCell();
       HtmlTableCell htc2 = new HtmlTableCell();
       
       DropDownList drp = new DropDownList();
       
       int startWith = 6;        

        if (oDt.Rows.Count > 0)
        {
            for (int iCnt = 0; iCnt <= oDt.Rows.Count - 1; iCnt++)
            {
                htr = new HtmlTableRow();
                htc1 = new HtmlTableCell();
                htc2 = new HtmlTableCell();
               
                if (bool.Parse(oDt.Rows[iCnt]["IsMandatory"].ToString()))
                {
                    sTempHTML += "<font class=\"alert\">*</font> ";
                }

                if (oDt.Rows[iCnt]["FldType"].ToString() == "DropDownList")
                {
                    drp = new DropDownList();
                    drp.ID = oDt.Rows[iCnt]["FieldID"].ToString();
                    drp.Items.Clear();

                    DataTable dp = oDst.Tables[1];

                    foreach (DataRow da in dp.Rows)
                    {
                        if (oDt.Rows[iCnt]["FieldId_PK"].ToString() == da["FormFileds_Mstr_PK"].ToString())
                        {
                            drp.Items.Add(new ListItem(da["FieldValue"].ToString(), da["FieldValue"].ToString()));
                        }
                    }
                }                
               

                htr.Cells.Add(htc1);
                htr.Cells.Add(htc2);

                DynamicTable.Rows.Insert(startWith, htr);
                startWith = startWith + 1;
               
            }
        }
    }
   
   
   
    Some ASPX CODE
   
    <asp:Panel ID="pnlMain" runat="server" Width="100%">
          <table width="100%" cellpadding="3" cellspacing="0" border="0" id="DynamicTable" runat="server" >
                <tr>
                    <td colspan="2" class="alert">
                        <asp:Literal ID="lblMsgDisplay" runat="server" SkinID="lblErrSkin"></asp:Literal>
                            </td>
                </tr>
                <tr>
                    <td align="right">
                        <font class="alert">
                                        <asp:Literal runat="server" ID="litLoginMandatory2" Text="*"></asp:Literal>
                                  </font>
                        <asp:Literal ID="lblUserName" runat="server" Text="Username:"></asp:Literal></td>
                    <td align="left">
                        <asp:TextBox ID="txtUserName" runat="server" MaxLength="20"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="RFVUserName" runat="server" ControlToValidate="txtUserName"
                            ErrorMessage="Please enter user name" SetFocusOnError="True" Display="None" ValidationGroup="vgOnlineUser"></asp:RequiredFieldValidator></td>
                </tr>
                <tr>
                    <td align="right">
                        <asp:Label ID="lblSalutation" runat="server" Text="Salutation:"></asp:Label></td>
                    <td align="left">
                        <asp:DropDownList ID="cmbSalutation" runat="server"></asp:DropDownList></td>
                </tr>
                <tr>
                    <td align="right">
                        <font class="alert">
                                        <asp:Literal runat="server" ID="litLoginMandatory" Text="*"></asp:Literal>
                                  </font>
                        <asp:Label ID="lblFirstName" runat="server" Text="First name:"></asp:Label></td>
                    <td align="left">
                        <asp:TextBox ID="txtFirstName" runat="server" MaxLength="50"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="RFVFirstName" runat="server" ControlToValidate="txtFirstName" ErrorMessage="Please enter first name" SetFocusOnError="True" Display="None" ValidationGroup="vgOnlineUser"></asp:RequiredFieldValidator></td>
                </tr>
               
                <tr>
                    <td align="right">
                        <font class="alert">
                                        <asp:Literal runat="server" ID="litLoginMandatory3" Text="*"></asp:Literal>
                                  </font>
                        <asp:Label ID="lblSurname" runat="server" Text="Surname:"></asp:Label></td>
                    <td align="left">
                        <asp:TextBox ID="txtSurName" runat="server" MaxLength="50"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="RFVSurname" runat="server" ControlToValidate="txtSurName"
                            ErrorMessage="Please enter your surname" SetFocusOnError="True" Display="None" ValidationGroup="vgOnlineUser"></asp:RequiredFieldValidator>
                        </td>
                </tr>
                <tr>
                    <td align="right">
                        <font class="alert">
                                        <asp:Literal runat="server" ID="litLoginMandatory4" Text="*"></asp:Literal>
                                  </font>
                        <asp:Label ID="lblEmail" runat="server" Text="Email:"></asp:Label></td>
                    <td align="left">
                        <asp:TextBox ID="txtEmail" runat="server" MaxLength="100"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="RFVEmail" runat="server" ControlToValidate="txtEmail" ErrorMessage="Please enter email" SetFocusOnError="True" Display="None" ValidationGroup="vgOnlineUser"></asp:RequiredFieldValidator>
                        <asp:RegularExpressionValidator ID="Rexpvemail" runat="server" ControlToValidate="txtEmail" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" ErrorMessage="Invalid email (name@domain.com)" SetFocusOnError="True" Display="None" ValidationGroup="vgOnlineUser"></asp:RegularExpressionValidator>                </td>
                </tr>        
                                                       
                <tr >
                    <td>&nbsp;</td>
                        <td id="submitTD" runat="server">
                        <asp:Button ID="btnSubmit" runat="server" OnClick="btnSubmit_Click" ValidationGroup="vgOnlineUser" Text="Apply" CssClass="formButtonFocus" />
                    <asp:Button ID="btnReset" OnClientClick="javascript:window.document.forms[0].reset(); return false;" runat="server" Text="Reset" CausesValidation="False" CssClass="formButton" />
                    <asp:ValidationSummary runat="server" ID="OnlineUserSummary" EnableClientScript="True"
                            ShowMessageBox="True" ShowSummary="False" validationgroup="vgOnlineUser"></asp:ValidationSummary>
                          <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
                      </td>
                </tr>
            </table>
    </asp:Panel>Start Free Trial 
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On click on button 
 
 
 
protected void btnSubmit_Click(object sender, EventArgs e)
{
        DropDownList SecurityQuestionDrp = (DropDownList)this.FindControl("SecurityQuestion"); // SecurityQuestion is the dynamic ID
 
        string strDrp = SecurityQuestionDrp.SelectedValue;
}
 
 
 
// Generates Dynamic dropdownlist and add to the html table DynamicTable after row 6
 
private void GetDynamicHTML()
    {
        oDynmcFld = new DynamicFieldBL();
        DataSet oDst = oDynmcFld.GetFieldsByFormId("GetFieldsByFormId", 1);
        oDst.Relations.Add("ControlValuesRelation", oDst.Tables[0].Columns["FieldId_PK"], oDst.Tables[1].Columns["FormFileds_Mstr_PK"]);
        
        DataTable oDt = oDst.Tables[0];
 
       HtmlTableRow htr = new HtmlTableRow();
       HtmlTableCell htc1 = new HtmlTableCell();
       HtmlTableCell htc2 = new HtmlTableCell();
       
       DropDownList drp = new DropDownList();
       
       int startWith = 6;        
 
        if (oDt.Rows.Count > 0)
        {
            for (int iCnt = 0; iCnt <= oDt.Rows.Count - 1; iCnt++)
            {
                htr = new HtmlTableRow();
                htc1 = new HtmlTableCell();
                htc2 = new HtmlTableCell();
                
                if (bool.Parse(oDt.Rows[iCnt]["IsMandatory"].ToString()))
                {
                    sTempHTML += "<font class=\"alert\">*</font> ";
                }
 
                if (oDt.Rows[iCnt]["FldType"].ToString() == "DropDownList")
                {
                    drp = new DropDownList();
                    drp.ID = oDt.Rows[iCnt]["FieldID"].ToString();
                    drp.Items.Clear();
 
                    DataTable dp = oDst.Tables[1];
 
                    foreach (DataRow da in dp.Rows)
                    {
                        if (oDt.Rows[iCnt]["FieldId_PK"].ToString() == da["FormFileds_Mstr_PK"].ToString())
                        {
                            drp.Items.Add(new ListItem(da["FieldValue"].ToString(), da["FieldValue"].ToString()));
                        }
                    }
                }                
                
 
                htr.Cells.Add(htc1);
                htr.Cells.Add(htc2);
 
                DynamicTable.Rows.Insert(startWith, htr);
                startWith = startWith + 1;
                
            }
        }
    }
    
    
    
    Some ASPX CODE
    
    <asp:Panel ID="pnlMain" runat="server" Width="100%">
          <table width="100%" cellpadding="3" cellspacing="0" border="0" id="DynamicTable" runat="server" >
                <tr>
                    <td colspan="2" class="alert">
                        <asp:Literal ID="lblMsgDisplay" runat="server" SkinID="lblErrSkin"></asp:Literal>
    				</td>
                </tr>
                <tr>
                    <td align="right">
                        <font class="alert">
    						<asp:Literal runat="server" ID="litLoginMandatory2" Text="*"></asp:Literal>
    					</font>
                        <asp:Literal ID="lblUserName" runat="server" Text="Username:"></asp:Literal></td>
                    <td align="left">
                        <asp:TextBox ID="txtUserName" runat="server" MaxLength="20"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="RFVUserName" runat="server" ControlToValidate="txtUserName"
                            ErrorMessage="Please enter user name" SetFocusOnError="True" Display="None" ValidationGroup="vgOnlineUser"></asp:RequiredFieldValidator></td>
                </tr>
                <tr>
                    <td align="right">
                        <asp:Label ID="lblSalutation" runat="server" Text="Salutation:"></asp:Label></td>
                    <td align="left">
                        <asp:DropDownList ID="cmbSalutation" runat="server"></asp:DropDownList></td>
                </tr>
                <tr>
                    <td align="right">
                        <font class="alert">
    						<asp:Literal runat="server" ID="litLoginMandatory" Text="*"></asp:Literal>
    					</font>
                        <asp:Label ID="lblFirstName" runat="server" Text="First name:"></asp:Label></td>
                    <td align="left">
                        <asp:TextBox ID="txtFirstName" runat="server" MaxLength="50"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="RFVFirstName" runat="server" ControlToValidate="txtFirstName" ErrorMessage="Please enter first name" SetFocusOnError="True" Display="None" ValidationGroup="vgOnlineUser"></asp:RequiredFieldValidator></td>
                </tr>
                
                <tr>
                    <td align="right">
                        <font class="alert">
    						<asp:Literal runat="server" ID="litLoginMandatory3" Text="*"></asp:Literal>
    					</font>
                        <asp:Label ID="lblSurname" runat="server" Text="Surname:"></asp:Label></td>
                    <td align="left">
                        <asp:TextBox ID="txtSurName" runat="server" MaxLength="50"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="RFVSurname" runat="server" ControlToValidate="txtSurName"
                            ErrorMessage="Please enter your surname" SetFocusOnError="True" Display="None" ValidationGroup="vgOnlineUser"></asp:RequiredFieldValidator>
                        </td>
                </tr>
                <tr>
                    <td align="right">
                        <font class="alert">
    						<asp:Literal runat="server" ID="litLoginMandatory4" Text="*"></asp:Literal>
    					</font>
                        <asp:Label ID="lblEmail" runat="server" Text="Email:"></asp:Label></td>
                    <td align="left">
                        <asp:TextBox ID="txtEmail" runat="server" MaxLength="100"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="RFVEmail" runat="server" ControlToValidate="txtEmail" ErrorMessage="Please enter email" SetFocusOnError="True" Display="None" ValidationGroup="vgOnlineUser"></asp:RequiredFieldValidator>
                        <asp:RegularExpressionValidator ID="Rexpvemail" runat="server" ControlToValidate="txtEmail" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" ErrorMessage="Invalid email (name@domain.com)" SetFocusOnError="True" Display="None" ValidationGroup="vgOnlineUser"></asp:RegularExpressionValidator>                </td>
                </tr>        
                                                        
                <tr >
                    <td>&nbsp;</td>
                  	<td id="submitTD" runat="server">
                        <asp:Button ID="btnSubmit" runat="server" OnClick="btnSubmit_Click" ValidationGroup="vgOnlineUser" Text="Apply" CssClass="formButtonFocus" />
                    <asp:Button ID="btnReset" OnClientClick="javascript:window.document.forms[0].reset(); return false;" runat="server" Text="Reset" CausesValidation="False" CssClass="formButton" />
                    <asp:ValidationSummary runat="server" ID="OnlineUserSummary" EnableClientScript="True"
                            ShowMessageBox="True" ShowSummary="False" validationgroup="vgOnlineUser"></asp:ValidationSummary>
                          <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
                      </td>
                </tr>
            </table>
    </asp:Panel>
[+][-]11.21.2007 at 11:09AM PST, ID: 20330170

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About this solution

Zones: C# Programming Language, Programming for ASP.NET
Tags: dropdownlist, dynamic
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Solution Provided By: raterus
Participating Experts: 1
Solution Grade: A
 
 
[+][-]11.22.2007 at 01:42AM PST, ID: 20333472

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[+][-]11.23.2007 at 03:37AM PST, ID: 20338315

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

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