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ASP.Net/C# - Checkbox Databinder Specified Cast Invalid? Bool?

Posted on 2008-06-16
4
1,666 Views
Last Modified: 2010-04-21
Hello all.  I have a static datatable where I set the datacolumn "W9" to a Boolean datatype but my ASCX code is still throwing a cast error, any idea?  My code is in the snippet here.  The W9 column is the one I am testing with to get this to work.
code behind: Datatable code:

  private DataTable Contributors

    {

        get

        {

            //object obj = this.Session["Employees"];

            //if ((!(obj == null)))

            //{

            //    return ((DataTable)(obj));

            //}

            //DataTable myDataTable = new DataTable();

            //myDataTable = GetDataTable("SELECT * FROM Employees");

            //this.Session["Employees"] = myDataTable;

            //return myDataTable;

            object obj = this.Session["Contributors"];

            if ((!(obj == null)))

            {

                return ((DataTable)(obj));

            }
 

            System.Data.DataTable dt;

            dt = new DataTable();
 

            // Columns

            DataColumn ContributorID;

            DataColumn FirstName;

            DataColumn MiddleInitial;

            DataColumn LastName;

            DataColumn FullName;

            DataColumn Email;

            DataColumn DisplayName;

            DataColumn DisplayBookWebsite;

            DataColumn ContributorRole;

            DataColumn AddressLine1;

            DataColumn AddressLine2;

            DataColumn City;

            DataColumn State;

            DataColumn PostalCode;

            DataColumn Country;

            DataColumn CitizenShipType;

            DataColumn RoyaltyRecipient;

            DataColumn RoyaltyPayableTo;

            DataColumn SSNTaxID;

            DataColumn EFT;

            DataColumn W9;

            

            // Initialize the columns

            ContributorID = new DataColumn("ContributorID");

            FirstName = new DataColumn("FirstName");

            MiddleInitial = new DataColumn("MiddleInitial");

            LastName = new DataColumn("LastName");

            FullName = new DataColumn("FullName");

            Email = new DataColumn("Email");

            DisplayName = new DataColumn("DisplayName");

            DisplayBookWebsite = new DataColumn("DisplayBookWebsite");

            ContributorRole = new DataColumn("ContributorRole");

            AddressLine1 = new DataColumn("AddressLine1");

            AddressLine2 = new DataColumn("AddressLine2");

            City = new DataColumn("City");

            State = new DataColumn("State");

            PostalCode = new DataColumn("PostalCode");

            Country = new DataColumn("Country");

            CitizenShipType = new DataColumn("CitizenShipType");

            RoyaltyRecipient = new DataColumn("RoyaltyRecipient");

            RoyaltyPayableTo = new DataColumn("RoyaltyPayableTo");

            SSNTaxID = new DataColumn("SSNTaxID");

            EFT = new DataColumn("EFT");

            W9 = new DataColumn("W9");

            W9.DataType = System.Type.GetType("System.Boolean");
 

            // Add columns

            dt.Columns.Add(ContributorID);

            dt.Columns.Add(FirstName);

            dt.Columns.Add(MiddleInitial);

            dt.Columns.Add(LastName);

            dt.Columns.Add(FullName);

            dt.Columns.Add(Email);

            dt.Columns.Add(DisplayName);

            dt.Columns.Add(DisplayBookWebsite);

            dt.Columns.Add(ContributorRole);

            dt.Columns.Add(AddressLine1);

            dt.Columns.Add(AddressLine2);

            dt.Columns.Add(City);

            dt.Columns.Add(State);

            dt.Columns.Add(PostalCode);

            dt.Columns.Add(Country);

            dt.Columns.Add(CitizenShipType);

            dt.Columns.Add(RoyaltyRecipient);

            dt.Columns.Add(RoyaltyPayableTo);

            dt.Columns.Add(SSNTaxID);

            dt.Columns.Add(EFT);

            dt.Columns.Add(W9);
 

            //Add DataRows to DataTable

            DataRow myRow;

            myRow = dt.NewRow();

            myRow["ContributorID"] = 123;

            myRow["FirstName"] = "Sean";

            myRow["MiddleInitial"] = "";

            myRow["LastName"] = "Bornstein";

            myRow["FullName"] = "Sean Bornstein";

            myRow["Email"] = "sbornstein@authorhouse.com";

            myRow["DisplayName"] = "";

            myRow["DisplayBookWebsite"] = false;

            myRow["ContributorRole"] = "Contributor";

            myRow["AddressLine1"] = "12 Water Road";

            myRow["AddressLine2"] = "";

            myRow["City"] = "Scituate";

            myRow["State"] = "MA";

            myRow["PostalCode"] = "02066";

            myRow["Country"] = "USA";

            myRow["CitizenshipType"] = "US Citizen";

            myRow["RoyaltyRecipient"] = true;

            myRow["RoyaltyPayableTo"] = "Sean Bornstein";

            myRow["SSNTaxID"] = "337665482";

            myRow["EFT"] = false;

            myRow["W9"] = true;

            dt.Rows.Add(myRow);
 

            myRow = dt.NewRow();

            myRow["ContributorID"] = 234;

            myRow["FirstName"] = "Jack";

            myRow["MiddleInitial"] = "";

            myRow["LastName"] = "Flash";

            myRow["FullName"] = "Jack Flash";

            myRow["Email"] = "jflash@authorhouse.com";

            myRow["DisplayName"] = "";

            myRow["DisplayBookWebsite"] = true;

            myRow["ContributorRole"] = "Agent";

            myRow["AddressLine1"] = "5 Waterhill Lane";

            myRow["AddressLine2"] = "";

            myRow["City"] = "South Boston";

            myRow["State"] = "MA";

            myRow["PostalCode"] = "02127";

            myRow["Country"] = "USA";

            myRow["CitizenshipType"] = "US Citizen";

            myRow["RoyaltyRecipient"] = false;

            myRow["RoyaltyPayableTo"] = "";

            myRow["SSNTaxID"] = "";

            myRow["EFT"] = false;

            myRow["W9"] = true;

            dt.Rows.Add(myRow);
 

            myRow = dt.NewRow();

            myRow["ContributorID"] = 789;

            myRow["FirstName"] = "Leopold";

            myRow["MiddleInitial"] = "";

            myRow["LastName"] = "Butters";

            myRow["FullName"] = "Leopold Butters";

            myRow["Email"] = "butters@authorhouse.com";

            myRow["DisplayName"] = "";

            myRow["DisplayBookWebsite"] = true;

            myRow["ContributorRole"] = "Co-Author";

            myRow["AddressLine1"] = "33 South Park Rd";

            myRow["AddressLine2"] = "";

            myRow["City"] = "South Park";

            myRow["State"] = "IN";

            myRow["PostalCode"] = "47403";

            myRow["Country"] = "USA";

            myRow["CitizenshipType"] = "US Citizen";

            myRow["RoyaltyRecipient"] = true;

            myRow["RoyaltyPayableTo"] = "Butters";

            myRow["SSNTaxID"] = "222989876";

            myRow["EFT"] = true;

            myRow["W9"] = false;

            dt.Rows.Add(myRow);
 

            myRow = dt.NewRow();

            myRow["ContributorID"] = 908;

            myRow["FirstName"] = "Eric";

            myRow["MiddleInitial"] = "";

            myRow["LastName"] = "Cartman";

            myRow["FullName"] = "Eric Cartman";

            myRow["Email"] = "cartman@authorhouse.com";

            myRow["DisplayName"] = "respect authority";

            myRow["DisplayBookWebsite"] = true;

            myRow["ContributorRole"] = "Contributor";

            myRow["AddressLine1"] = "865 South Park Rd";

            myRow["AddressLine2"] = "";

            myRow["City"] = "South Park";

            myRow["State"] = "IN";

            myRow["PostalCode"] = "47403";

            myRow["Country"] = "USA";

            myRow["CitizenshipType"] = "US Citizen";

            myRow["RoyaltyRecipient"] = true;

            myRow["RoyaltyPayableTo"] = "Kitty";

            myRow["SSNTaxID"] = "111345678";

            myRow["EFT"] = false;

            myRow["W9"] = true;

            dt.Rows.Add(myRow);
 

            myRow = dt.NewRow();

            myRow["ContributorID"] = 227;

            myRow["FirstName"] = "Stan";

            myRow["MiddleInitial"] = "";

            myRow["LastName"] = "Marsh";

            myRow["FullName"] = "Stan Marsh";

            myRow["Email"] = "smarsh@authorhouse.com";

            myRow["DisplayName"] = "";

            myRow["DisplayBookWebsite"] = true;

            myRow["ContributorRole"] = "Contributor";

            myRow["AddressLine1"] = "211 South Park Rd";

            myRow["AddressLine2"] = "";

            myRow["City"] = "South Park";

            myRow["State"] = "IN";

            myRow["PostalCode"] = "47403";

            myRow["Country"] = "USA";

            myRow["CitizenshipType"] = "US Citizen";

            myRow["RoyaltyRecipient"] = false;

            myRow["RoyaltyPayableTo"] = "";

            myRow["SSNTaxID"] = "";

            myRow["EFT"] = false;

            myRow["W9"] = false;

            dt.Rows.Add(myRow);
 

            myRow = dt.NewRow();

            myRow["ContributorID"] = 999;

            myRow["FirstName"] = "Yoggi";

            myRow["MiddleInitial"] = "";

            myRow["LastName"] = "Bear";

            myRow["FullName"] = "Yoggi Bear";

            myRow["Email"] = "ybear@authorhouse.com";

            myRow["DisplayName"] = "";

            myRow["DisplayBookWebsite"] = false;

            myRow["ContributorRole"] = "Contributor";

            myRow["AddressLine1"] = "33 Yellowstonr Park";

            myRow["AddressLine2"] = "";

            myRow["City"] = "Yellowstone";

            myRow["State"] = "NH";

            myRow["PostalCode"] = "23223";

            myRow["Country"] = "USA";

            myRow["CitizenshipType"] = "US Citizen";

            myRow["RoyaltyRecipient"] = false;

            myRow["RoyaltyPayableTo"] = "";

            myRow["SSNTaxID"] = "";

            myRow["EFT"] = false;

            myRow["W9"] = false;

            dt.Rows.Add(myRow);
 

            this.Session["Contributors"] = dt;
 

            return dt;

        }

    }
 

ASCX Code:

<asp:CheckBox ID="cbxW9" Checked='<%# (DataBinder.Eval(Container, "DataItem.W9") is DBNull ?false:Eval("W9")) %>'  runat="server" />

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Comment
Question by:sbornstein2
  • 2
4 Comments
 
LVL 14

Expert Comment

by:ajitha75
ID: 21799376
W9 column seems to be fine. The problem i think is with EFT and other columns which are declared as string datatype
0
 
LVL 22

Expert Comment

by:prairiedog
ID: 21799377
Try this:
<asp:CheckBox ID="cbxW9" Checked='<%# (DataBinder.Eval(Container, "DataItem.W9")=DBNull.Value ?false:(bool)Eval("W9")) %>'  runat="server" />

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0
 
LVL 22

Accepted Solution

by:
prairiedog earned 250 total points
ID: 21799384
Sorry, missed a "=".
<asp:CheckBox ID="cbxW9" Checked='<%# (DataBinder.Eval(Container, "DataItem.W9")==DBNull.Value ?false:(bool)Eval("W9")) %>'  runat="server" />

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0
 

Author Closing Comment

by:sbornstein2
ID: 31467839
thanks perfect
0

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