GridView CheckBox: Server Error in '/' Application. Conversion from type 'DBNull' to type 'Boolean' is not valid

Server Error in '/' Application.
Conversion from type 'DBNull' to type 'Boolean' 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: Conversion from type 'DBNull' to type 'Boolean' is not valid.

Source Error:


Line 102:                    </EditItemTemplate>
Line 103:                    <ItemTemplate>
Line 104:                        <asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# Bind("Cases") %>' Enabled="false" />
Line 105:                    </ItemTemplate>
Line 106:                </asp:TemplateField>


Source File: C:\Users\Makumbi\source\repos\INTERVIEWSVB\INTERVIEWSVB\Forms\Casestudents.aspx    Line: 104

Stack Trace:


[InvalidCastException: Conversion from type 'DBNull' to type 'Boolean' is not valid.]
   Microsoft.VisualBasic.CompilerServices.Conversions.ToBoolean(Object Value) +1314924
   ASP.forms_casestudents_aspx.__DataBinding__control40(Object sender, EventArgs e) in C:\Users\Makumbi\source\repos\INTERVIEWSVB\INTERVIEWSVB\Forms\Casestudents.aspx:104
   System.Web.UI.Control.OnDataBinding(EventArgs e) +86
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +154
   System.Web.UI.Control.DataBind() +17
   System.Web.UI.Control.DataBindChildren() +187
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +164
   System.Web.UI.Control.DataBind() +17
   System.Web.UI.Control.DataBindChildren() +187
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +164
   System.Web.UI.Control.DataBind() +17
   System.Web.UI.WebControls.GridView.CreateRow(Int32 rowIndex, Int32 dataSourceIndex, DataControlRowType rowType, DataControlRowState rowState, Boolean dataBind, Object dataItem, DataControlField[] fields, TableRowCollection rows, PagedDataSource pagedDataSource) +170
   System.Web.UI.WebControls.GridView.CreateChildControls(IEnumerable dataSource, Boolean dataBinding) +3839
   System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) +67
   System.Web.UI.WebControls.GridView.PerformDataBinding(IEnumerable data) +15
   System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) +133
   System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +34
   System.Web.UI.WebControls.DataBoundControl.PerformSelect() +151
   System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +76
   System.Web.UI.WebControls.GridView.DataBind() +10
   INTERVIEWSVB.Casestudents.Button2_Click(Object sender, EventArgs e) in C:\Users\Makumbi\source\repos\INTERVIEWSVB\INTERVIEWSVB\Forms\Casestudents.aspx.vb:41
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +9796242
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +211
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +12
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +15
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1696


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4465.0 

<asp:GridView ID="Studentgrid" runat="server"  ItemStyle-Width="Auto" AutoGenerateColumns="False">
            <Columns>
                <asp:CommandField HeaderText="Edit Record" ShowHeader="True" ShowSelectButton="True" />
                <asp:BoundField DataField="admno" HeaderText="Admno" ReadOnly="True" />
                <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
                <asp:BoundField DataField="Class" HeaderText="Class" SortExpression="Class" />
                <asp:BoundField DataField="Stream" HeaderText="Stream" SortExpression="Stream" />
                <asp:BoundField DataField="Category" HeaderText="Category" SortExpression="Category" />
                <asp:BoundField DataField="Intake" HeaderText="Intake" SortExpression="Intake" />
                <asp:BoundField DataField="comment" HeaderText="Comment" />
                <asp:TemplateField>
                    <EditItemTemplate>
                        <asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# Bind("Cases") %>' />
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# Bind("Cases") %>' Enabled="false" />
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>