CS0266: Cannot implicitly convert type 'object' to 'System.Data.SqlClient.SqlDataReader'. this error conduct the line dr=cmd.executescalar()

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1.00/5 (2 votes)

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C#

public int membercount(string tbl, string condition)
    {
        string query = null;
        if (condition.Trim().Length > 0) 
        {
            query = query + "where" + condition;
        }
        else
        {
            query = query;
        }
        cmd = new SqlCommand(query, con);
       dr= cmd.ExecuteScalar();
        return a;   
    }

Posted 6-Jun-13 23:59pm

suganya M

Updated 7-Jun-13 0:00am

CHill60

v3

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lukeer 7-Jun-13 8:14am

Don't post the same question[^] again.
Use the "Improve question" link beneath your original question instead to provide further insight that can help potential answerers helping you.

2 solutions

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_Amy · Answer 1 · 2013-06-07T00:38:00

As I can see in your code block, dr is SqlDataReader object. Where as cmd.ExecuteScalar()[^] returns the first column of the first row in the result set returned by the query. Additional columns or rows are ignored.

Additionally, I can see one more problem in your code is, your SQL query is wrong. I am modifying the query here. You can check it once.
Try this:

C#

public int membercount(string tbl, string condition)
{
    string query = "SELECT COUNT(*) FROM " + tbl; //Since your function is for counting member.
    if (condition.Trim().Length > 0)
    {
        query = query + " where " + condition;
    }
    cmd = new SqlCommand(query, con);
    int a = Convert.ToInt32(cmd.ExecuteScalar());//Converting the returned value to Int32
    return a;
}

--Amit

Rohini P · Answer 2 · 2013-06-07T00:12:00

Solution 1

Actually the Executescaler() method returns

the first column of the first row in the result set returned by the query. Additional columns or rows are ignored.

but u have assigned it to the dr .Thats why u are getting this error.

Posted 7-Jun-13 0:12am

Rohini P