How to calculate months to start date and display in end date

Question

1.00/5 (1 vote)

See more:

SQL-Server-2008R2

want to add months to start date and display in end date .my code is

i have 3 text boxes

Number of months
Start date
End date

when i enter 5 months those add to start date and display that in end date .when start date text box index changed

i have tried following

protected void Button1_Click(object sender, EventArgs e)
{
SqlCommand cmd = new SqlCommand("Insert into monthcal values (@NoOfMonths,@StartDate,@EndDate)", con);
cmd.Parameters.AddWithValue("@NoOfMonths", txtNoOfMonths.Text.ToString());
cmd.Parameters.AddWithValue("@StartDate", txtStartDate.Text.ToString());
cmd.Parameters.AddWithValue("@EndDate", txtEndDate.Text.ToString());
con.Open();
cmd.ExecuteNonQuery();

}
protected void txtStartDate_TextChanged(object sender, EventArgs e)
{
DateTime startDate = DateTime.Parse(txtStartDate.Text);

startDate.AddMonths(txtNoOfMonths.Text);
txtEndDate.Text = startDate.ToString("yyyy-MM-dd");
}
}

------------------

startDate.AddMonths(txtNoOfMonths.Text);

am getting error there as
Error 3 Argument 1: cannot convert from 'string' to 'int'
Error 2 The best overloaded method match for 'System.DateTime.AddMonths(int)' has some invalid arguments

Posted 22-May-15 21:21pm

Member 11382784

Add a Solution

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 · Accepted Answer · 2015-05-22T21:36:00

Start by converting your user inputs to the appropriate datatypes:

C#

int months;
if (!int.Parse(txtNoOfMonths.Text, out months))
   {
   // Report problem with number!
   return;
   }
DateTime startDate;
if (!DateTime.Parse(txtStartDate.Text, out startDate))
   {
   // Report problem with Date!
   return;
   }

Then use those values:

C#

DateTime endDate = startDate.AddMonths(months);
txtEndDate.Text = endDate>ToString();

And use the converted values instead of string values to pass directly to SQL.
(And please, don't say "But my database is all NVARCHAR" - because if it is, that needs to be fixed first!)