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DropDownList have undefined value after page validation

Like in title. After the page validation dropdownlist look like lost connection with some columns from table:
This is the code:

<ej:DropDownList ID="ddlRegimen" runat="server" Width="100%" WatermarkText="Regimen" DataSourceID="SqlDataRegim" DataTextField="RegimenName" DataValueField="RegimenId"></ej:DropDownList>

<asp:SqlDataSource ID="SqlDataRegim" runat="server" ConnectionString="<%$ ConnectionStrings:dbhlpConnString %>" SelectCommand="SELECT [RegimenId], [RegimenName] FROM [Regimen]"></asp:SqlDataSource>

<asp:RequiredFieldValidator ID="RequiredFieldValidator11" runat="server" ForeColor="Red" Font-Size="12px" ErrorMessage="Select regimen for this person" InitialValue="" ControlToValidate="ddlRegimen" Display="Dynamic"></asp:RequiredFieldValidator>

2 Replies

TO Tomasz December 18, 2016 01:15 PM

ok solved :) put connection string in code behind fix the problem if is in "If(!IsPostBack):

if (!IsPostBack)


SqlCommand cmd = new SqlCommand("Select [CountryId], [CountryName] from [Country]", conn);

SqlDataAdapter da = new SqlDataAdapter(cmd);

DataSet ds = new DataSet();



this.ddlcountry.DataSource = ds.Tables[0];




PO Prince Oliver Syncfusion Team December 18, 2016 11:47 PM

Hi Tomasz, 

We are glad to know your problem has solved. please let us know if you need further assistance on this. 


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