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Search database for value and get info c# Forms [closed]

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I have a database called "users" where user information is saved. When you login with your name and pass, your name is send to the homeform, where i want to get the "to-do list" that's saved in the database with your info. Here's my code so far:
db_connection();
MySqlCommand cmd = new MySqlCommand();
cmd.CommandText = "SELECT * FROM `user` WHERE `username`=#username AND `todo`=#todo";
So basically i need to get the todo of the user (which is sent to this form as _name) lets say admin, and display it in tbTodo.

if it is in the same form you can try using
select `user`.todo from `user` where `username` = #username
considering username is unique

If the main problem is parameters - u can use property Parameters:
cmd.Parameters.AddWithValue("#username", user);
There is an example in msdn:
SqlCommand command = new SqlCommand(commandText, connection);
command.Parameters.Add("#ID", SqlDbType.Int);
command.Parameters["#ID"].Value = customerID;
// Use AddWithValue to assign Demographics.
// SQL Server will implicitly convert strings into XML.
command.Parameters.AddWithValue("#demographics", demoXml);
try
{
connection.Open();
Int32 rowsAffected = command.ExecuteNonQuery();
Console.WriteLine("RowsAffected: {0}", rowsAffected);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}

C# How to get DataTable value [closed]

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I still new to C# and just have 3 months plus of learning process. I would like to seeking advice on how to extract data value from my DataTable I have create for validation checking.
private void checker
{
string sqlSelect2 = "SELECT a.AccNo, a.CompanyName , a.CreditLimit, FROM Debtor a JOIN";
}
which i have named TableCehecker, i do not need to put it to gridview, just for checking purposes.
In the private void process how can I extract dataTable TableCehecker and the value?
Thank you,
Brian

You need to follow the Docs from MSDN:
SqlConnection sqlConnection1 = new SqlConnection("Your Connection String");
SqlCommand cmd = new SqlCommand();
SqlDataReader reader;
cmd.CommandText = "SELECT * FROM Customers";
cmd.CommandType = CommandType.Text;
cmd.Connection = sqlConnection1;
sqlConnection1.Open();
reader = cmd.ExecuteReader();
// Data is accessible through the DataReader object here.
DataTable dt = new DataTable();
dt.Load(reader);
sqlConnection1.Close();
You can then check whatever you want of data inside the DataTable either by querying or by looping through the rows and checking the column values.
Based on your comments, to extract values from single row:
DataRow drow = dt.Rows[0];
string value = drow.Field<string>("CompanyName");

how to pass parameter to oracle function within c# environment [closed]

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I search on the net to execute oracle stored function and get the value of it
and I found something similar to this but i don't really understand it so i am not able to find out what's the error with it... please if someone can explan
whats happening after opening the connection with the database ?
public void Get_Office_Desc()
{
string oradb = "Data Source=mysource;User Id=emp;Password=00;";
var v_Office_code = Current_Office_code.Text;
string CommandStr = "F_Get_Office_Desc(:pOfficeCode)";
using (OracleConnection conn = new OracleConnection(oradb))
using (OracleCommand cmd = new OracleCommand(CommandStr, conn))
{
conn.Open();
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new OracleParameter("pOfficeCode", v_Office_code));
cmd.Parameters.Add("pOfficeDesc", OracleType.Char, 128);
cmd.Parameters["pOfficeDesc"].Direction = ParameterDirection.ReturnValue;
cmd.ExecuteNonQuery();
var pOfficeDesc = Convert.ToString(cmd.Parameters["pOfficeDesc"].Value);
messagebox.show(pOfficeDesc);
}
}

You need to set CommandType to StoredProcedure - like that:
cmd.CommandType = CommandType.StoredProcedure;

C# urdu writing not read from database [closed]

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SqlConnection con = new SqlConnection("Data Source=ALIZEE_TROTT\\SQLEXPRESS;Initial Catalog=UrduStemmer;Persist Security Info=false; User ID=sa;Password=password");
SqlDataAdapter sda = new SqlDataAdapter("select * from stop_word_list where word_list='کو' ", con);
DataTable dt = new System.Data.DataTable();
sda.Fill(dt);
if (dt.Rows.Count == 1)
{
MessageBox.Show("Ok");
}
else
{
MessageBox.Show("not ok");
}

First make sure that your column for word_list is one of following type
nchar
nvarchar
ntext
You must precede all Unicode strings with a prefix N when you deal with Unicode string constants in SQL Server
SELECT * FROM stop_word_list WHERE word_list = N'کو'
Hope that helps.

delete data on SQL table based on datatable input [closed]

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This method below goes into a table and deletes all of the table. But in the datatable "table" below in the first column there are dates which i would like to be deleted from the database. how would i go about doing this
Datatable table = new DataTable()
string sqlConnectionString =
"Server = 100.720.8.196; Database = testDat; User Id = sa; Password = ";
// Copy the DataTable to SQL Server
using (SqlConnection conn = new SqlConnection(sqlConnectionString))
{
string deleteSting =
"delete from dbo.testTable where clientId=1212";
conn.Open();
using (SqlCommand cmd = new SqlCommand(deleteSting, conn))
{
cmd.ExecuteNonQuery();
}
conn.Close();
}

I'm just guessing here, you probably mean to make the date column empty. If that's the case then you use UPDATE, like:
string updateString =
"UPDATE dbo.testTable SET datecol = #datecol where clientId=#clientID";
conn.Open();
using (SqlCommand cmd = new SqlCommand(updateString, conn))
{
cmd.Parameters.Add("#datecol", SqlDbType.Date).Value = DbNull.Value;
cmd.Parameters.Add("#clientID", SqlDbType.Int).Value = 1212;
cmd.ExecuteNonQuery();
}
conn.Close();

Well, there are a few options. You could loop through your table and create a string containing your dates in a comma separated list. With that, you can create a SQL Statement like delete from table where dateCol in (date1, date2, date3, etc...)
Or you could just loop through your data table, and do one delete per loop iteration. Either way will work.
However you decide to proceed, make sure to use parameters instead of string concatenation to prevent issues like SQL Injections:
http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.parameters.aspx