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POC#: Add Parameters to stored procedure inside a loop
 

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  1. POC#: Add Parameters to stored procedure inside a loop
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    <p>I have been trying to add parameters to a stored procedure inside a loop. Below given is the code where I declared my variables.</p> <pre><code> SqlConnection con = new SqlConnection(); Connect conn = new Connect(); SqlDataReader readerCourseID = null; con = conn.getConnected(); con.Open(); SqlCommand cmdAssignCourse; cmdAssignCourse = new SqlCommand("assignCourse", con); cmdAssignCourse.CommandType = CommandType.StoredProcedure; cmdAssignCourse.Parameters.Add("@sID", System.Data.SqlDbType.VarChar); cmdAssignCourse.Parameters.Add("@cID", System.Data.SqlDbType.VarChar); SqlParameter retValue = cmdAssignCourse.Parameters.Add("return", System.Data.SqlDbType.Int); </code></pre> <p>And below is the code where I inserted values into the variables that were declared earlier.</p> <pre><code>foreach (DataRow row in dt.Rows) { //get course id from course name. Pass row["Course Name"].ToString() int i = getCourseID(row["Course Name"].ToString()); //assignment of the course to student cmdAssignCourse.Parameters["@sID"].Value = studentCurrID.Value.ToString(); cmdAssignCourse.Parameters["@cID"].Value = i; retValue.Direction = ParameterDirection.ReturnValue; cmdAssignCourse.ExecuteNonQuery(); if (retValue.Value.ToString() == "0") { MessageBox.Show("Added Course Successfully!"); //return 0; } else { MessageBox.Show("An error occured! Possibly a duplication of data!"); //return -1; } } </code></pre> <p>However this code runs successfully and displays the message "Added Course Successfully!" once. But after the first successful run every other run it gives me "An error occured! Possibly a duplication of data!" message. The possible error is not clearing out the variables. How to clear the below variables. Please help me with this. Thanks!</p>
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    1. USdon
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    1. COTry using SqlServer Profiler to see what your code sends to the database. This will give you an asnwer whether your parameter values change or not.
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      1. POC#: Add Parameters to stored procedure inside a loop
      1. USRePierre
    2. COAre you sure there are no duplicate entries in the datatable `dt`? Why are you passing integers as varchars?
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      1. POC#: Add Parameters to stored procedure inside a loop
      1. USpodiluska
 

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