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Editorial Team
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Asked: 2026-06-11T08:37:53+00:00

The code below Works ok; from 01st to 12th of every month; However as

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The code below Works ok; from 01st to 12th of every month; However as soon as I click on 13th or greater date I Get this error

Conversion failed when converting date and/or time from character string.

This my Code

 DateTime dt = Convert.ToDateTime(Calendar1.SelectedDate.ToString("yyyy-MM-dd"));

    myConnection.Open();
    string cmdStr1 = "SELECT COUNT(*) FROM Payment WHERE PaymentDate = '" + dt + "'";
    SqlCommand PIDexist1 = new SqlCommand(cmdStr1, myConnection);
    int temp1 = Convert.ToInt32(PIDexist1.ExecuteScalar().ToString());
    myConnection.Close();

Thank for your Help

This is How Date is saved in my Database 2012-01-13

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1 Answer

  1. Editorial Team

    No, never bind dates like that. Let the .NET data provider handle this for you – there are just way too many pitfalls with locales on the App and Sql Server for you to use strings as dates.

    myConnection.Open();
string cmdStr1 = "SELECT COUNT(*) FROM Payment WHERE PaymentDate = @dt'";
SqlCommand PIDexist1 = new SqlCommand(cmdStr1, myConnection);
SqlParameter parameter = PIDexist1.Parameters.Add("@dt", System.Data.SqlDbType.DateTime);
parameter.Value = dt;
...
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