Object Reference Not set to an instance of an object error

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Hi

I'm getting error "object reference not set to an instance of an object".
I know the reason for this error if assigned DataSet is empty at that time we face this type of issue's but my DataSet Having data. Then why it's showing this error....

my code is like this

C#

protected void gvMaterials_RowDataBound(object sender, GridViewRowEventArgs e)
{ 

       if (e.Row.RowType == DataControlRowType.DataRow && (e.Row.RowState ==       DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate))
       {
            Label lblMaterial_Id = (Label)e.Row.FindControl("lblMaterial_Id");
            DataList dlQuantities = (DataList)e.Row.FindControl("dlQuantities");
            DataSet ds = obj.Get_Planned_Material_Qty(Proj_Code,lblMaterial_Id.Text);
                                 
            dlQuantities.DataSource = ds;            
            dlQuantities.DataBind();
                
       }
}

This is my code i'm facing pblm on highlited line, but my DataSet having 18 rows.
What's the reason it's showing that error....

Can Any one help me to resolve this issue....

Posted 13-Mar-13 0:02am

Naveen.Sanagasetti

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Comments

Karthik Harve 13-Mar-13 6:06am

dataset is having rows, that is fine, have you checked, does the object "dlQuantities" is null or not ?

Naveen.Sanagasetti 13-Mar-13 6:08am

Can u plz explain eloborate about "dlQuantities" is null or not....

Karthik Harve 13-Mar-13 6:12am

you are finding the control "dlQuantities", does that controls exists ?, if that controls not exists, that object becomes null and if you are trying to access null object, then this error will occur. just put the break point at that line, and place mouse pointer over the object, you can see whether it is null or not.

Naveen.Sanagasetti 13-Mar-13 6:12am

dlQuantities is NULL

Karthik Harve 13-Mar-13 6:13am

so, that is the reason for error.

Naveen.Sanagasetti 13-Mar-13 6:15am

dlQuantities control is exist, then also i'm facing the object value is null....
How to overcome this issue now...

Naveen.Sanagasetti 13-Mar-13 6:18am

Can you plz explain the reason of this error, what are the cases we see this type of error
like Binded data is empty....

Karthik Harve 13-Mar-13 6:26am

can you show the ItemTemplate html of the grid view ?

Naveen.Sanagasetti 13-Mar-13 6:23am

you are finding the control "dlQuantities", does that controls exists ?, if that controls not exists, that object becomes null and if you are trying to access null object, then this error will occur. just put the break point at that line, and place mouse pointer over the object, you can see whether it is null or not.

This is very help full to me thanks alot...

Karthik Harve 13-Mar-13 6:27am

Welcome !!

3 solutions

Solution 2

you shoud provide dataset like ds.tables[0]. it may work!!!!

Posted 13-Mar-13 0:10am

vijetatomar

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CPallini · Accepted Answer · 2013-03-13T00:06:00

Solution 1

Either ds or dlQuantities is an invalid reference.

Posted 13-Mar-13 0:06am

CPallini

v2

Comments

Naveen.Sanagasetti 13-Mar-13 6:10am

Can u plz explain eloborate about "dlQuantities" is an invalid reference....

Abhinav S · Accepted Answer · 2013-03-13T00:11:00

Solution 4

This error occurs when you try and access a property or attribute of an object that itself is null.
Debug and step through your code to figure out what the problem could be.

Posted 13-Mar-13 0:11am

Abhinav S