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Asked: 2026-05-11T06:00:17+00:00

I’m not very experienced in ASP.Net, as I work mostly with PHP. I’m trying

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I’m not very experienced in ASP.Net, as I work mostly with PHP. I’m trying this, but it doesn’t work:

<asp:TextBox runat='server' ID='txtAnswer'    TextMode='<%# IIf(DataBinder.Eval(Container.DataItem, 'DoLargeInput'), 'MultiLine', 'SingleLine' )%>' Text=''></asp:TextBox>

DoLargeInput is a boolean.

Why doesn’t this work?

I’m gettin the following error:

System.InvalidCastException: Conversion from string 'MultiLine' to type 'Integer' is not valid. ---> System.FormatException: Input string was not in a correct format.    at Microsoft.VisualBasic.CompilerServices.Conversions.ParseDouble(String Value, NumberFormatInfo NumberFormat)    at Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value)    --- End of inner exception stack trace ---    at Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value)    at Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(Object Value)    at ASP.profile_questions_aspx.__DataBinding__control6(Object sender, EventArgs e)    at System.Web.UI.Control.OnDataBinding(EventArgs e)    at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)    at System.Web.UI.Control.DataBind()    at System.Web.UI.Control.DataBindChildren()    at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)    at System.Web.UI.Control.DataBind()    at System.Web.UI.WebControls.Repeater.CreateItem(Int32 itemIndex, ListItemType itemType, Boolean dataBind, Object dataItem)    at System.Web.UI.WebControls.Repeater.CreateControlHierarchy(Boolean useDataSource)    at System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e)    at System.Web.UI.WebControls.Repeater.DataBind()    at profile_questions.LoadObjects()

Any help would be greatly appreciated. Thanks!

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1 Answer

  1. Try:-

    IIf(DataBinder.Eval(Container.DataItem, 'DoLargeInput'), TextBoxMode.MultiLine, TextBoxMode.SingleLine

    It the parse that will convert TextMode=’MultiLine’ approriately for you. At the point this binding code happens the parseing is over, you need to specify the value as you would in code.

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