To clear a error incorrect syntax near '=' in windows application

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i have error as incorrect syntax near '=' , in given coding. please correct that error

C#

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
       {

           cmd = new SqlCommand(" select * from imagedemo where='"+listBox1.SelectedItem.ToString()+"'", con);
           con.Open();
           SqlDataReader dr;
           try
           {
               dr = cmd.ExecuteReader();
               if (dr.Read())
               {
                   byte[] picture = (byte[])dr["imgimage"];
                   ms = new MemoryStream(picture);
                   ms.Seek(0, SeekOrigin.Begin);
                   pictureBox1.Image = Image.FromStream(ms);

               }

           }
           catch (Exception ex)
           {
               MessageBox.Show(ex.Message);
           }
           finally
           {
               con.Close();
           }
       }

Posted 1-Nov-11 0:07am

ananth2012

Updated 1-Nov-11 0:12am

Abhinav S

v2

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Abhinav S 1-Nov-11 6:13am

Tags added.

3 solutions

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Abhinav S · Answer 1 · 2011-11-01T00:11:00

Solution 1

There is an issue with the query select * from imagedemo where='"+listBox1.SelectedItem.ToString()+"'".
You have not provided the column name.

Try running this query in the SQL backend editor directly to see if the syntax is all correct.

Posted 1-Nov-11 0:11am

Abhinav S

Comments

Amir Mahfoozi 1-Nov-11 6:30am

+5

Wayne Gaylard · Answer 2 · 2011-11-01T00:24:00

Your SQL query does not state the field that you are querying against. Instead of WHERE = , you should have WHERE yourField = (where yourField should be substituted for the name af the field you wish to query against. You should also consider using parameterised queries instead of string concatenation, so I would write the query like this:-

SELECT field1, field2, field3 FROM myTable WHERE field4 = @field4Parameter;<br />
mycommand.Parameters.AddWithValue("@field4Parameter", myParameter)

Notice i named all my fields in the query instead of using the * symbol. That way when I retrieve the results they always come back in the same order.

Hope that helps

member60 · Answer 3 · 2011-11-01T00:29:00

Solution 3

You are missing parameter in where clause,must specify field name after where and before =

Posted 1-Nov-11 0:29am

member60