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Select specific row in SQL Server

I´m starting to develop in C# and SQL Server, I don´t know how to extract information from one excel specific colum.
I have this code working, but what i need it´s to compare a textbox with a specific column and get the data:
Example
Select *
From T_Empleado
Where "Specific column" = "textbox".
public void mostrarExcel()
{
String name = "Sheet1";
String constr = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source=" + "C:\\Users\\alegriad\\Desktop\\sample\\Book2.xlsx" + "; Extended Properties='Excel 12.0 XML;HDR=YES;';";
OleDbConnection con = new OleDbConnection(constr);
OleDbCommand oconn = new OleDbCommand("Select * From [" + name + "$]'", con);
con.Open();
OleDbDataAdapter sda = new OleDbDataAdapter(oconn);
DataTable data = new DataTable();
sda.Fill(data);
dgv_Reporte.DataSource = data;
}//mostrarExcel
Thank you.

You can write your query like this
OleDbCommand oconn = new OleDbCommand("Select * From [" + name + "$] where columnName = '"+ YourTextboxValue+ "'" , con);
I try with sample excel like below
And my query like this
OleDbCommand oconn = new OleDbCommand("Select * From [" + name + "$] WHERE Name = 'T1'", con);
This works for me.

Gridview not sorting and paging for excel sheet in asp

I have a gridview and it is taking the data from an excel sheet. In visual studio, from the properties menu of the gridview I have just set paging and sorting enabled. But this is not working. Is it about the excel source or should I add some extra code ?
string whereClause = SearchTextBox.Text;
String name = "Sheet0";
String constr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" +
"C:\\Users\\BerkayS\\Desktop\\VSCLOGN.xls" +
";Extended Properties='Excel 12.0 XML;HDR=YES;';";
OleDbConnection con = new OleDbConnection(constr);
OleDbCommand oconn = new OleDbCommand("Select " + selectedCriteria + " From [" + name + "$] where USER_ID = '" + whereClause + "'", con);
con.Open();
OleDbDataAdapter sda = new OleDbDataAdapter(oconn);
DataTable data = new DataTable();
sda.Fill(data);
GridView2.DataSource = data;
GridView2.DataBind();
GridView2.Visible = true;
Note: Ignore some variable names in the code, they are assigned before

Im having difficulty setting my OleDb connection

Hi there I am trying to establish a connection to a data source and extract the information and display it in a grid view. The problem is that i always get null value for ada. Is it possible to have mistyped the query or is there something wrong with the adapter?
Furthermore I am using the myInt variable to insert different data sources because i hav to process more than one file, maybe this could be problematic as well.
try
{
//establish connectioin
OleDbConnection conn = new OleDbConnection(("provider=Microsoft.Jet.OLEDB.4.0; " + ("data source=" + myInt + ";" + "Extended Properties=Excel 8.0;")));
OleDbDataAdapter ada = new OleDbDataAdapter("SELECT * FROM MarkingSheet$]", conn);
DataSet ds = new DataSet();
ada.Fill(ds);
dataGridView1.DataSource = ds.Tables[0].DefaultView;
conn.Close();
}
ANSWER
Thats what worked for me
OleDbConnection conn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + myPath + ";Excel 12.0;HDR=YES;"); ;
conn.Open();
OleDbDataAdapter ada = new OleDbDataAdapter("select * from [Marking Sheet$]", conn); ;
DataSet ds = new DataSet();
ada.Fill(ds);

Change the sql to
"SELECT * FROM [MarkingSheet$]"
since there's a missing opening bracket.

The Fault in your code is that you havent opened a connection when you attempt to fill the Adapter. Your SQL Statement is also wrong. You may also wan wish to bind the DataTable to the DataGridView too like this :-
try
{
OleDbConnection conn = new OleDbConnection(("provider=Microsoft.Jet.OLEDB.4.0; " + ("data source=" + myInt + ";" + "Extended Properties=Excel 8.0;")));
OleDbDataAdapter ada = new OleDbDataAdapter("SELECT * FROM [MarkingSheet$]", conn);
DataSet ds = new DataSet();
conn.Open();
ada.Fill(ds.Tables[0]);
conn.Close();
BindingSource bs = new BindingSource();
bs.Datasource = ds.Tables[0];
dataGridView1.DataSource = bs;
}
catch(OledbException x)
{
// Handle Exception
}
EDIT **
Try Changing your connection string to :-
string connString = "provider=Microsoft.Jet.OLEDB.4.0;Data source=" + myInt + ";Extended Properties=Excel 8.0;HDR=Yes;IMEX=1\";";

Syntax error when opening an Excel workbook using C#

When I try to open an Excel workbook I get a syntax error. Here is the code I'm using:
string connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;"
+ "Data Source=" + fileName + ";"
+"Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\";";
OleDbConnection objConn = new OleDbConnection(connectionString);
OleDbCommand objCommand = new OleDbCommand(#"SELECT * FROM Sheet1$", objConn);
OleDbDataAdapter odjAdp = new OleDbDataAdapter();
odjAdp.SelectCommand = objCommand;
DataTable dt1 = new DataTable();
odjAdp.Fill(dt1);
GridView2.DataSource = dt1;
GridView2.DataBind();
Why is this happening?

Because of the dollar symbol that sheet name needs to be escaped, enclose it in square brackets;
#"SELECT * FROM [Sheet1$]"

Joining two Excel Files and Displaying in a GridView

I have two different Excel files (.xls). There is a column named KATIP in excel1.xls, and there is a column named SAVCI in excel2.xls. I want to get these columns and merge them into a table named Nobet with 2 columns: SAVCI and KATIP.
Then I want to show them in a Gridview Control in ASP.NET. I have working code, but when I run it, it's getting the first column named KATIP then getting the column named SAVCI. They are not merged, and they appear as different columns.
OleDbConnection DBConnection = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" +
Server.MapPath("~/App_Data/excel1.xls") + ";" + "Extended Properties=\"Excel 8.0;HDR=Yes\"");
DBConnection.Open();
string SQLString = "SELECT * FROM [Page1$]";
OleDbCommand DBCommand = new OleDbCommand(SQLString, DBConnection);
OleDbDataAdapter da = new OleDbDataAdapter(DBCommand);
DataSet ds = new DataSet("Nobet");
da.Fill(ds,"Nobet");
DBConnection.Close();
DBConnection = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" +Server.MapPath("~/App_Data/excel2.xls") + ";" + "Extended Properties=\"Excel 8.0;HDR=Yes\"");
DBConnection.Open();
DBCommand = new OleDbCommand(SQLString, DBConnection);
da = new OleDbDataAdapter(DBCommand);
da.Fill(ds,"Nobet");
GridView1.DataSource = ds.Tables["Nobet"];
GridView1.DataBind();
DBConnection.Close();

I solved my problem... here is what I did:
OleDbConnection DBConnection = new
OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" +
Server.MapPath("~/App_Data/savcilik_katip.xls") + ";" + "Extended Properties=\"Excel 8.0;HDR=Yes\"");
DBConnection.Open();
OleDbCommand DBCommand = new OleDbCommand("SELECT * FROM [Sayfa1$]", DBConnection);
OleDbDataAdapter da = new OleDbDataAdapter(DBCommand);
DataSet ds = new DataSet("Nobet");
da.Fill(ds, "Nobet");
DBConnection.Close();
DBConnection = new
OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" +
Server.MapPath("~/App_Data/savcilik_savci.xls") + ";" + "Extended Properties=\"Excel 8.0;HDR=Yes\"");
DBConnection.Open();
DBCommand = new OleDbCommand("SELECT * FROM [Sayfa1$]", DBConnection);
da = new OleDbDataAdapter(DBCommand);
da.Fill(ds, "Nobetci");
DBConnection.Close();
for (int i = 0; i < ds.Tables["Nobet"].Rows.Count; i++)
{
ds.Tables["Nobet"].Rows[i]["SAVCI"] = ds.Tables["Nobetci"].Rows[i]["SAVCI"];
}
GridView1.DataSource = ds.Tables["Nobet"];
GridView1.DataBind();