Create new row in dataset

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i am trying to add new row in dataset for table already created in dataset with name retired ,
i get below error:
Object reference not set to an instance of an object.

any idea please?

What I have tried:

 DataRow dr = ds.Tables["retired"].NewRow();
                   dr["Empno"] = empno.Text;
                   dr["Empname"] = name.Text;
                   dr["Formno"] = formon.Text ;
                   dr["x1"] = "X";
ds.Tables["retired"].Rows.Add(dr);

Posted 8-Feb-17 0:55am

loai_maane

Updated 8-Feb-17 4:15am

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Michael_Davies 8-Feb-17 7:00am

Which line?

loai_maane 19-Feb-17 6:03am

first line, i already create data table with same name retired

ZurdoDev 8-Feb-17 7:12am

No idea, because you did not tell us which line of code caused it. But the error is saying something doesn't exist that you are trying to access. Just fix it.

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#realJSOP · Answer 1 · 2017-02-08T01:17:00

Solution 1

Without more info, I can only guess that it might be that the table "retired" does not exist in the Tables collection.

Posted 8-Feb-17 1:17am

#realJSOP

Member 10007226 · Answer 2 · 2017-02-08T01:31:00

First Thing First . replace ds.Tables["retired"].NewRow(); with ds.Tables[0].NewRow(). Dont give table name . Give Table ID. And it will solve your issue.

Example For you
DataSet ds = new DataSet();
DataTable dt = new DataTable();
dt.Columns.Add("ID", typeof(string));
dt.Columns.Add("name",typeof(string));
DataRow dr = dt.NewRow();
dr["ID"] = "1";
dr["name"] = "Chaueby";
dt.Rows.Add(dr);
ds.Tables.Add(dt);
//from Here your Solution Start
DataRow dr1 = ds.Tables[0].NewRow();
dr1["ID"] = "Chaubey1";
dr1["name"] = "Chaubasdasdey1";
ds.Tables[0].Rows.Add(dr1);
Your solution should be like this. . NO Table Name

Ramesh Kumar Barik · Answer 3 · 2017-02-08T04:15:00

public partial class Class1 : Page
{
DataSet ds = null;
protected void Page_Load(object sender, EventArgs e)
{
DataSet ds2 = GetDataSet();

DataTable dt2 = ds.Tables["retired"];
DataRow dr = dt2.NewRow();
dr["Empno"] = "2";
dr["Empname"] = "Aa";
dr["Formno"] = "Bb";

dt2.Rows.Add(dr);
ds.Tables.Remove("retired");
ds.Tables.Add(dt2);
}

public DataSet GetDataSet()
{
ds = new DataSet();
DataTable dt = new DataTable("retired");
dt.Columns.Add("Empno");
dt.Columns.Add("Empname");
dt.Columns.Add("Formno");

DataRow dr = dt.NewRow();
dr["Empno"] = "1";
dr["Empname"] = "A";
dr["Formno"] = "B";

dt.Rows.Add(dr);
ds.Tables.Add(dt);
return ds;
}
}
Check this code if it may help you.

Create new row in dataset

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