Skip to content

Searcharticlesvideosblogsforumsinterview questionsarticles

Tech
Articles
Blogs
News
Videos
Interviews
Forums
Books
Events
- Jobs
- Stories

Article
Blog
Video
Ebook
Interview Question

Loading

Upcoming Events

23 NOV
AI Agents Conference 2026 - 3rd Edition

Our Training Programs

AI & Machine Learning
Mastering Large Language Models
Mastering Prompt Engineering
Certified Vibe Coder
Github Copilot Training
Generative AI for Beginners
n8n Automation & AI Agents Training

About Us Contact Us Privacy Policy Terms Brand Guidelines Partners C# Tutorials Consultants Ideas Report A Bug FAQs Sitemap Stories CSharp TV DB Talks Web3 Universe Jumpstart Blockchain

©2026 C# Corner.

All contents are copyright of their authors.

ArgumentNullException: dataType' argument can't be null

Home
Forums
Learn iOS Programming

ArgumentNullException: dataType' argument can't be null

Prabhat 7154it

6yAsked Nov 29, 2019, 5:18 AM2kLearn iOS Programming

System.ArgumentNullException: ''dataType' argument cannot be null.

Parameter name: dataType'

foreach (DataGridViewColumn column in CategoryGV.Columns)

{

dt.Columns.Add(column.HeaderText, column.ValueType);

}

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Sign in to answer this question

It is the same account you read, post and publish with — and you will come straight back to this page.

Sign in Create an account

Jaimin Shethiya6y ago
Hello,

can you please use below code for value type is nul

foreach (DataGridViewColumn column in CategoryGV.Columns)
{
dt.Columns.Add(column.HeaderText, column.ValueType ?? DBNull.Value);
}

let me know if you have needed any other help.

Thanks
0
Jenith Thakkar6y ago
You have to check DBNULL before do any operation on DataTable
First check if ternury operator work if don't then use second option

First Method:

foreach (DataGridViewColumn column in CategoryGV.Columns)
{
column.ValueType=column.ValueType== DBNull.Value?"":column.ValueType
dt.Columns.Add(column.HeaderText, column.ValueType);
}
Second Method:
foreach (DataGridViewColumn column in CategoryGV.Columns)
{
if(column.ValueType== DBNull.Value)
dt.Columns.Add(column.HeaderText, column.ValueType);
else
dt.Columns.Add(column.HeaderText, column.ValueType);
}
0