GridView RowUpdating Problem

Question

1.00/5 (1 vote)

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I'm getting Null reference exception.

C#

protected void gvDetails_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
Label s_no = (Label)gvDetails.Rows[e.RowIndex].FindControl("s_no");
TextBox project_name =(TextBox)gvDetails.Rows[e.RowIndex].FindControl("project_name");
TextBox r_name = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("r_name");
TextBox rel_start_date=(TextBox)gvDetails.Rows[e.RowIndex].FindControl("Release_start_date");
TextBox rel_end_date =(TextBox)gvDetails.Rows[e.RowIndex].FindControl("Release_EndDate");         
 con.Open();
            
MySqlCommand cmd = new MySqlCommand("update lut_release_name1 set project_name='" + project_name.Text + "',r_name='" + r_name.Text + "',Release_start_date='" + rel_start_date.Text + "',Release_EndDate='" + rel_end_date.Text + "' where s_no=" + Convert.ToInt32(s_no.Text), con);
            
cmd.ExecuteNonQuery();
                
gvDetails.EditIndex = -1;
con.Close();
BindEmployeeDetails();
        }

Posted 20-Apr-15 4:14am

sunnykvinod

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Comments

Richard Deeming 20-Apr-15 10:40am

Your code is vulnerable to SQL Injection[^].

NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query.

Deepak Kanswal Sharma 20-Apr-15 23:33pm

Where is the connection string ????????? "con"

ConnectingKamlesh 21-Apr-15 3:48am

on which line are you getting null reference exception?

3 solutions

Solution 1

You don't have a Connection object defined and you are trying to open and close a connection. Instantiate the proper object and assign it its proper values.

SqlConnection con= new SqlConnection("your connections string");

Posted 20-Apr-15 11:19am

Richard C Bishop

Updated 20-Apr-15 11:21am

v3

Comments

sunnykvinod 21-Apr-15 2:22am

i have sqlconnection declared Outside that is not the problem

Richard C Bishop 21-Apr-15 8:13am

Fair enough, but for future reference, it is helpful to put the whole context of the exception into perspective. From what you posted and said, my solution is the obvious answer, as is eluded to in the comment section above. Take care!

Solution 2

I guess you need to do this:-

C#

protected void gvDetails_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {

SqlConnection con =new SqlConnection("@data source="connection"; initial catalog=database name; intigrated security=true");

con.open();

-------- Your Code-----------------

con.Close();
}

Posted 20-Apr-15 17:37pm

Deepak Kanswal Sharma

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sunnykvinod · Accepted Answer · 2015-04-21T01:12:00

Solution 4

Control name was wrong that leads to the NullReferenceException.

Posted 21-Apr-15 1:12am

sunnykvinod