Specified cast is not valid. ASP Radiobutton - asp.net

Question

I am getting the following error:
Specified cast is not valid.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.InvalidCastException: Specified cast is not valid.
Code:
<asp:RadioButtonList ID="rbtVerified" runat="server" Visible='<%#!(bool)Eval("ReadOnly") %>' >
<asp:ListItem Value="1">Accept</asp:ListItem>
<asp:ListItem Value="2">Reject</asp:ListItem>
</asp:RadioButtonList>
Value ReadOnly is being retrieved successfully from the database and it is bool (saved as bit in sql server. What exactly could the problem be?
Exception is also being thrown here when trying to bind the data (Note: bool testis just a test to check if variable ReadOnly being retrieved properly from the database.
DataTable dt = new LeaveLogic().GetManagerUnverifiedLeaveRequests(Convert.ToInt32(Context.User.Identity.Name));
if (dt.Rows.Count > 0)
{
bool test = Convert.ToBoolean(dt.Rows[0]["ReadOnly"]);
RptLeaveRequests.DataSource = dt;
RptLeaveRequests.DataBind();
}
More detaield error:
System.InvalidCastException was unhandled by user code
HResult=-2147467262
Message=Specified cast is not valid.
Source=App_Web_kdnthep4
StackTrace:
at ASP.webpages_verifyleaverequests_aspx.__DataBinding__control43(Object sender, EventArgs e) in c:\Users\Samsung\Desktop\Development\Ticketing system\1.PresentationLayer\WebPages\VerifyLeaveRequests.aspx:line 35
at System.Web.UI.Control.OnDataBinding(EventArgs e)
at System.Web.UI.WebControls.ListControl.OnDataBinding(EventArgs e)
at System.Web.UI.WebControls.ListControl.PerformSelect()
at System.Web.UI.WebControls.BaseDataBoundControl.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.Control.DataBindChildren()
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.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 _1.PresentationLayer.WebPages.VerifyLeaveRequests.BindData() in C:\Users\Samsung\Desktop\Development\Ticketing system\1.PresentationLayer\WebPages\VerifyLeaveRequests.aspx.cs:line 58
at _1.PresentationLayer.WebPages.VerifyLeaveRequests.Page_Load(Object sender, EventArgs e) in C:\Users\Samsung\Desktop\Development\Ticketing system\1.PresentationLayer\WebPages\VerifyLeaveRequests.aspx.cs:line 24
at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
InnerException: