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Error in insert query in visual studio

I'm new in this field. Trying to insert the values from textbox to my database table, but I get an error at
adapter.InsertCommand.ExecuteNonQuery();
Can anyone help me solve this?
SqlCommand command;
SqlDataAdapter adapter = new SqlDataAdapter();
String sql = "insert into NewName values('" + first_Name.Text + "','" + last_Name.Text + "','" + user.Text + "','" + email.Text + "','" + password.Text + "','" + contact.Text + "')";
command = new SqlCommand(sql,con);
adapter.InsertCommand = new SqlCommand(sql,con);
// this line here is showing the error
adapter.InsertCommand.ExecuteNonQuery();
command.Dispose();
con.Close();

Since your table is called table and that is a SQL reserved word, you have two choices:
Change your table name. This is the only option you should be considering but for completeness;
Quote the name of the table:
insert into [table] values....

You do not list your column name on insert. This means you are also attempting to insert your identity column as well. Always list your column names
insert into NewName (firstname, lastname, username, email, password, contact)
values('" + first_Name.Text + "','" + last_Name.Text + "','" + user.Text + "','" + email.Text + "','" + password.Text + "','" + contact.Text + "')

Yes I've done it .I was using "user" in table column which is not allowed .After changing the column name everything works.
This is the code
SqlCommand command;
SqlDataAdapter adapter = new SqlDataAdapter();
String sql = "insert into NewName values('" + first_Name.Text + "','" + last_Name.Text + "','" + user.Text + "','" + email.Text + "','" + password.Text + "','" + contact.Text + "')";
command = new SqlCommand(sql, con);
adapter.InsertCommand = new SqlCommand(sql, con);
// this line here is showing the error
adapter.InsertCommand.ExecuteNonQuery();
command.Dispose();
con.Close();

How can i record the value once cause it creating multiple record? Database access c#

else {
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
command.CommandText = "select * from tbl_Checkins where CustomerName='" + textBox1.Text + "'and Gender ='" + textBox2.Text + "'and NumberofPerson ='" + textBox3.Text + "'and Address ='" + textBox5.Text + "'and ContactNumber ='" + textBox6.Text + "'and EmailAddress ='" + textBox7.Text + "'and RoomRate ='" + comboBox4.Text + "'and RoomType ='" + comboBox2.Text + "'and RoomNumber ='" + comboBox3.Text + "'and Checkindate ='" + DatePicker.Text + "'and Checkindate ='" + textBox4.Text + "'";
OleDbDataReader reader = command.ExecuteReader();
int count = 0;
while (reader.Read()){
count = count + 1;
}
if (count > 0){
MessageBox.Show("Customer already checkin");
}
connection.Close();
if (count < 1){
connection.Open();
command.CommandText = "insert into tbl_Checkins ([CustomerName],[Gender],[Numberofperson],[Address],[ContactNumber],[EmailAddress],[RoomRate],[RoomType],[RoomNumber],[Checkindate],[Checkintime]) values('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox5.Text + "','" + textBox6.Text + "','" + textBox7.Text + "','" + comboBox4.Text + "','" + comboBox2.Text + "','" + comboBox3.Text + "','" + DatePicker.Text + "','" + textBox4.Text + "')";
command.ExecuteNonQuery();
MessageBox.Show("Check IN");
connection.Close();
}
}
I want to display whether the customer already checked-in or not. However, using above code, a duplicate record is added to the database instead of just displaying the information.

How can i get result in two data table after execute the Query?

After execution result is coming in two select statement. How can get in two different data table by c#?
using (SqlConnection con = new SqlConnection(sqlConnString))
{
using (SqlCommand cmd = new SqlCommand())
{
cmd.CommandText = "Exec SPSearchInvoiceList_rjt " + _customerID + "," + _ProjectInchargeID + "," + _projectID +
"," + _invoiceType + ",'" + _projectTypes + "'," + _invoiceAmount + ",'" + _invoiceCode +
"'," + _invoiceStatusID + ",'" + _invoiceDateFrom + "','" + _invoiceDateTo + "','" +
_invoiceRevisedDateFrom + "','" + _invoiceRevisedDateTo + "','" + _invoiceRaiseDateFrom +
"','" + _invoiceRaiseDateTo + "'," + Convert.ToInt32(PageIndex) + 1 + "," + pageSize;
cmd.Connection = con;
con.Open();
var datareader = cmd.ExecuteReader();
con.Close();
}
}
I am trying to do it as above.I am unable to get records but i am able to get data once i execute commandtext in sql server. Please help.

Save,Update and delete page. Saving duplicated data

I was watching https://www.youtube.com/watch?v=SJ-RyDl5E7U It basically teaches me how to create my update and delete button after following the video my program works just like his!
But there is no "checking" statement for my btnSave, allowing the user to enter duplicated data in the data base if they click more than once shown here
So I was wondering if there is a "checking statement" I can use, like if the IndexNumber (first column) exist there will be a message box showing out saying something like "ID is already exists"
This is my current code for the btnSave
SqlConnection con = new SqlConnection(#"Data Source=(LocalDB)\v11.0; AttachDbFilename=" + Application.StartupPath + "\\GlennTeoDB.mdf; Integrated Security=True;Connect Timeout=30");
con.Open();
SqlCommand cmd = new SqlCommand(#"INSERT INTO GlennTeoStudents (IndexNumber,Name,Age,HandphoneNumber,GPA) VALUES ('" + numIN.Value + "','" + txtName.Text + "','" + txtAge.Text + "','" + txtHP.Text + "','" + numGPA.Value + "')", con);
cmd.ExecuteNonQuery();
con.Close();

As you are using ado.net something like this;
SqlConnection con = new SqlConnection(#"Data Source=(LocalDB)\v11.0; AttachDbFilename=" + "Application.StartupPath" + "\\GlennTeoDB.mdf; Integrated Security=True;Connect Timeout=30");
con.Open();
//get a count records with your index number
SqlCommand validate = new SqlCommand(string.Format("SELECT count(IndexNumber) FROM GlennTeoStudents WHERE IndexNumber = {0}", numIN.Value), con);
int count = (Int32)validate.ExecuteScalar();
if (count == 0)
{
//insert your unqiue index number into a new row
SqlCommand cmd = new SqlCommand(#"INSERT INTO GlennTeoStudents (IndexNumber,Name,Age,HandphoneNumber,GPA) VALUES ('" + numIN.Value + "','" + txtName.Text + "','" + txtAge.Text + "','" + txtHP.Text + "','" + numGPA.Value + "')", con);
cmd.ExecuteNonQuery();
}
else
{
//don't insert it, do something else like return an error
}
con.Close();

You should add an existence check:
SqlCommand cmd = new SqlCommand(#"INSERT INTO GlennTeoStudents (IndexNumber,Name,Age,HandphoneNumber,GPA) VALUES ('" + numIN.Value +
"','" + txtName.Text + "','" + txtAge.Text + "','" + txtHP.Text +
"','" + numGPA.Value + "') WHERE NOT EXISTS ( SELECT * FROM
GlennTeoStudents WHERE IndexNumber = '" + numIN.Value + "')", con);

Insert item to database

I have a problem with insert into statement..
cmd = new OleDbCommand("insert into FWINFOS (ID,Name,Gender,DateOfBirth,Race,WorkingPlace,PassportNO,DateOfExpire,Position,Photo) " +
"values('" + textBox5.Text + "','" + textBox1.Text + "','" + textBox2.Text +
"','" + dateTimePicker1.Value + "','" + textBox3.Text + "','" + textBox4.Text +
"','" + textBox6.Text + "','" + dateTimePicker2.Value + "',#Position,#Photo)", con);
conv_photo();
cmd.Parameters.AddWithValue("#Position", comboBox1.SelectedValue);
con.Open();
int n = cmd.ExecuteNonQuery();
//cmd.ExecuteNonQuery();
con.Close();
if (n > 0)
{
MessageBox.Show("Inserted");
loaddata();
rno++;
}
else
MessageBox.Show("No Insert");
ERROR : Syntax Error INSERT INTO
Anyone can advise me? Please, Sorry for my bad English grammar.

Seem like you are missing out a parameter in your query, try using this
cmd.CommandText = "insert into Table1 (id,Position) values (#id,#Position)";
cmd.parameters.addwithvalue("#id", textBox1.Text);
cmd.parameters.addwithvalue("#Position", combobox1.selectedvalue);
new updated
-the position is the oleh db reserved words, try change to this query, put the cover to Position like below
cmd = new OleDbCommand("insert into FWINFOS (ID,Name,Gender,DateOfBirth,Race,WorkingPlace,PassportNO,DateOfExpire,[Position],Photo) " +
"values('" + textBox5.Text + "','" + textBox1.Text + "','" + textBox2.Text +
"','" + dateTimePicker1.Value + "','" + textBox3.Text + "','" + textBox4.Text +
"','" + textBox6.Text + "','" + dateTimePicker2.Value + "',#Position,#Photo)", con);

You have missed adding #Photo parameter in your code.
That is ok for testing purpose but you should never insert to database this way. This expose your system to a SQL Injection. You should use parametrized queries where possible. Something like
int result=0;
using (OleDbConnection myConnection = new OleDbConnection ("YourConnectionString"))
{
cmd = new OleDbCommand("insert into FWINFOS (ID,Name,Gender,DateOfBirth,Race,WorkingPlace,PassportNO,DateOfExpire,Position,Photo) values (#ID, #Gender, #DateOfBirth, #Race, #WorkingPlace, #PassportNO, #DateOfExpire, #Position, #Photo)", con);
conv_photo();
cmd.Parameters.AddWithValue("#ID", textBox5.Text);
// Specify all parameters like this
try
{
con.Open();
result = Convert.ToInt32(cmd.ExecuteNonQuery());
}
catch( OledbException ex)
{
// Log error
}
finally
{
if (con!=null) con.Close();
}
}
if(result > 0)
// Show success message
Also note that OleDb parameters are positional, means you have to
specify them in the exact order as in your query. OleDbParameter Class (MSDN)

There is no value for parameter #Photo, and if your photo field is not nullable or empty
in database structure then how you can add null value in that.So make your data field
nullable or pass value to parameter #Photo.I think it will solve your problem.
cmd = new OleDbCommand("insert into FWINFOS (ID,Name,Gender,DateOfBirth,Race,WorkingPlace,PassportNO,DateOfExpire,Position,Photo) " +
"values('" + textBox5.Text + "','" + textBox1.Text + "','" + textBox2.Text +
"','" + dateTimePicker1.Value + "','" + textBox3.Text + "','" + textBox4.Text +
"','" + textBox6.Text + "','" + dateTimePicker2.Value + "',#Position,#Photo)", con);
conv_photo();
cmd.Parameters.AddWithValue("#Position", comboBox1.SelectedValue);
cmd.Parameters.AddWithValue("#Photo", assignvalue);
con.Open();
int n = cmd.ExecuteNonQuery();
//cmd.ExecuteNonQuery();
con.Close();
if (n > 0)
{
MessageBox.Show("Inserted");
loaddata();
rno++;
}
else
MessageBox.Show("No Insert");