I want to merge all data tables in single datagridview

Question

0.00/5 (No votes)

See more:

C#

Hello Guys,! i have created 4 data tables in my project and now i want to merge this all data tables in a single datagridview

What I have tried:

C#

DataSet dsa = new DataSet();
            DataTable dt1 = new DataTable();
            dsa.Tables.Add(dt1);
            OleDbDataAdapter da = new OleDbDataAdapter();
            da = new OleDbDataAdapter("SELECT [Flavours] As [Flavours],count(column2) As [Small] from [Total] Where [Date] between #" + dateTimePicker1.Value.ToString("dd/MM/yyyy") + "# AND #" + dateTimePicker2.Value.ToString("dd/MM/yyyy") + "# AND [column2] IN ('Small.......')Group By [Flavours]", VCON);
            da.Fill(dt1);
            dataGridView1.DataSource = dt1;
            VCON.Close();
            DataSet dsa1 = new DataSet();
            DataTable dt2 = new DataTable();
            dsa1.Tables.Add(dt2);
            OleDbDataAdapter da1 = new OleDbDataAdapter();
            da1 = new OleDbDataAdapter("SELECT [Flavours] As [Flavours],count(column2) As [Medium] from [Total] Where [Date] between #" + dateTimePicker1.Value.ToString("dd/MM/yyyy") + "# AND #" + dateTimePicker2.Value.ToString("dd/MM/yyyy") + "# AND [column2] IN ('Medium......')Group By [Flavours]", VCON);
            da1.Fill(dt2);
            dataGridView1.DataSource = dt2;
            VCON.Close();
            DataSet dsa2 = new DataSet();
            DataTable dt3 = new DataTable();
            dsa.Tables.Add(dt3);
            OleDbDataAdapter da2 = new OleDbDataAdapter();
            da2 = new OleDbDataAdapter("SELECT [Flavours] As [Flavours],count(column2) As [Large] from [Total] Where [Date] between #" + dateTimePicker1.Value.ToString("dd/MM/yyyy") + "# AND #" + dateTimePicker2.Value.ToString("dd/MM/yyyy") + "# AND [column2] IN ('Large.......')Group By [Flavours]", VCON);
            da2.Fill(dt3);
            dataGridView1.DataSource = dt3;
            VCON.Close();
            DataSet dsa3 = new DataSet();
            DataTable dt4 = new DataTable();
            dsa.Tables.Add(dt1);
            dsa.Tables.Add(dt2);
            dsa.Tables.Add(dt3);
            dsa.Tables.Add(dt4);
            OleDbDataAdapter da3 = new OleDbDataAdapter();
            da3 = new OleDbDataAdapter("SELECT [Flavours] As [Flavours],count(column2) As [Ex Large] from [Total] Where [Date] between #" + dateTimePicker1.Value.ToString("dd/MM/yyyy") + "# AND #" + dateTimePicker2.Value.ToString("dd/MM/yyyy") + "# AND [column2] IN ('Ex  Large...')Group By [Flavours]", VCON);
            da3.Fill(dt4);
            dataGridView1.DataSource = dt4;
            VCON.Close();

Posted 28-Sep-16 2:35am

Member 9983063

Updated 28-Sep-16 2:46am

Suvendu Shekhar Giri

v3

Add a Solution

Comments

[no name] 28-Sep-16 8:36am

Okay good. You have permission to proceed. No one here is going to stand in your way.

Suvendu Shekhar Giri 28-Sep-16 8:40am

What is the issue?

Member 9983063 28-Sep-16 8:44am

issue is i want to merge all data tables in a single datagridview that's it

Suvendu Shekhar Giri 28-Sep-16 8:45am

and with what you have tried, are you facing any error or issue?

Richard Deeming 28-Sep-16 10:10am

Your code is vulnerable to SQL Injection[^]. NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query.

Everything you wanted to know about SQL injection (but were afraid to ask) | Troy Hunt[^]
How can I explain SQL injection without technical jargon? | Information Security Stack Exchange[^]
Query Parameterization Cheat Sheet | OWASP[^]

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2016-09-28T02:46:00

The best way to do this is to use a single SELECT which combines the tables into a single set of columns - otherwise the DGV doesn't know what to do with it.
Generally, you would have common data in the tables - a foreign key or two - which lets SQL know which rows are related via a JOIN query:

SQL

SELECT u.UserName, a.Address FROM Users u
JOIN Addresses a ON a.UserID = u.ID

Which returns each user and his address from two tables connected via teh UserID foreign key into the Users table.

If you don't have such relationships, then pretty much you can't do it as SQL and teh DGV have no idea which rows to "bolt together" to display.