Errors_ in_ c#_Mysql

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I am trying insert query:It showing (You can't insert null value for this column)This Error How can i solve this problem;But i am passing value for all columns throug button click.
I tried following both query it's showing same error:(That three columns data type is varchar)
Hear is my coding;

C#

string date=datetimepicker1.value.tostring("dd-MM-yyyy")

Query type one:

C#

"insert into curculars values('"+ textBox3.Text + "','"+ date +"','"+comboBox5.Text +")'"

Query Type Two:

SQL

Insert into curculars(curc,date1,whom)values(@val1,@val2,@val3)

C#

cmd.mysqlparametter.add(new mysqlparametter("val1",textbox3.text));
cmd.mysqlparametter.add(new mysqlparametter("val2",date));
cmd.mysqlparametter.add(new mysqlparametter("val3",combobox5.text));

Posted 20-Sep-11 16:46pm

ngnagarajan

Updated 21-Sep-11 1:23am

v3

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Prerak Patel 20-Sep-11 23:27pm

Added code block.

1 solution

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Arun Kumar K S · Accepted Answer · 2011-09-20T17:29:00

Default date format of MySql is 'YYYY-MM-DD'

Change your

string date=datetimepicker1.value.tostring("dd-MM-yyyy")

to

string date=datetimepicker1.value.tostring("yyyy-MM-dd")

then try to insert

If you wanted to change the format of a MySQL date from YYYY-MM-DD to MM/DD/YYYY or DD/MM/YYYY format you can use the DATE_FORMAT() function as shown in the example below:

SELECT DATE_FORMAT(CURDATE(), '%d/%m/%Y')

OR

SELECT DATE_FORMAT(CURDATE(), '%m/%d/%Y')