[Solved] Cannot set Column ‘ID’ to be null. Please use DBNull instead in SharePoint Online

In this SharePoint csom example, I will explain how to solve error “Cannot set Column ‘ID’ to be null. Please use DBNull instead” which comes while working with client side object model (csom C#.Net) in SharePoint Online Office 365.

I have written some code to retrieve all the SharePoint list template and bind SharePoint list template to a dropdown list, and I got the error “Cannot set Column ‘ID’ to be null. Please use DBNull instead“. I have retrieved all the list template and stored to a data table and bind the list template to the dropdown list. I am trying to run the below code and got the error.

Web web = clientContext.Web;
ListTemplateCollection templateColl = web.ListTemplates;
clientContext.Load(templateColl);
clientContext.ExecuteQuery();

DataTable dt = new DataTable();
dt.Columns.Add(“ID”, typeof(Int32));
dt.Columns.Add(“Title”, typeof(string));

foreach (ListTemplate template in templateColl)
{
DataRow dr = dt.NewRow();
dr[“ID”] = template[“ID”];
dr[“Title”] = template.Name;
dt.Rows.Add(dr);
}

Once I run the above code, it gave me the below error in the below line.

dr["ID"] = template["ID"];

Solution to error ‘Cannot set Column ‘ID’ to be null. Please use DBNull instead’:

Here the error is coming because I have set the ID value as integer “dt.Columns.Add(“ID”, typeof(Int32));”.

dr[“ID”] = template[“ID”]; //But template[“ID”] returns null. So I have got the error  “Cannot set Column ‘ID’ to be null. Please use DBNull instead”.

So I have added “ListTemplateTypeKind” property whose return type is “integer”

dr[“ID”] = template.ListTemplateTypeKind;

You may like following SharePoint Online CSOM tutorials:

• Steps to add items from CSV file to SharePoint Online List using PowerShell in CSOM
• How to Use CAML Query for Boolean field for SharePoint 2013/2016/Online Object Model CSOM
• Upload large files to SharePoint online document library using PowerShell csom
• Copy list items from one site collection to another programmatically using CSOM in SharePoint Online

In the above SharePoint article, we were discussed how to resolve the error “Cannot set Column ‘ID’ to be null. Please use DBNull instead” while binding the SharePoint list template to the dropdown list in SharePoint online.